How could research on mice or rats help answer our medical research questions — questions that are, after all, about humans?

Answers

Answer 1

Answer:

you could disect them or observe what they do by doing things like putting them in a maze or seeing what they do in front of a mirror.

Explanation:


Related Questions

Lesson 5 Student Activity Sheets: How do bacteria grow?
PREDICTION:
1. If you could zoom in really close to see what was happening on a petri dish, what do you think you
would see?

Answers

Answer:I need some points,, I hope y’all can understand

Explanation:

The growth of bacteria can be observed as the bacteria grows very rapidly and fast by the process of asexual reproduction. They continuously multiplied and in very short period of time they divided from one to thousands.

What is asexual reproduction?

Asexual reproduction is defined as the process of reproduction in which only a single parent is involved. Reproduction has been defined as the process carried out by the living organisms and during the process of reproduction the living organisms produces their own young ones and feed them. Reproduction is the supreme quality of living things.

There are two types of reproduction and these are sexual and asexual reproduction. The process of reproduction in which two parents are involved is said to be sexual mode of reproduction and the process of reproduction in which only single parent is involved in known as asexual mode of reproduction. The example of asexual reproduction are budding, fragmentation, spore formation, and binary fission.

Therefore, The growth of bacteria can be observed as the bacteria grows very rapidly and fast by the process of asexual reproduction. They continuously multiplied and in very short period of time they divided from one to thousands.

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Fermentation is an example of which of the following pathways?

Answers

Answer:

 

Anaerobic respiration

Explanation:

penn

What are the dimensions of the human skeleton?

Answers

Answer

Human skeleton, the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and cartilages. There also are bands of fibrous connective tissue—the ligaments and the tendons—in intimate relationship with the parts of the skeleton. This article is concerned primarily with the gross structure and the function of the skeleton of the normal human adult.

,

What makes bottleneck dolphins such “ingenious fishermen”?

Answers

Bottleneck dolphins are a highly intelligent species that use sound both for communication and to hunt for food. They can search for food individually or in groups. What makes these creatures ingenious towards fishing is their distinctive whistle. This whistle helps them recognize one another and communicate.

Compare transitional aquatic ecosystems. Identify two types in the organizer below and describe the environments each type combines. 9th grade Biology

Answers

Answer:

The correct answer is -

wetlands - land and water

estuaries - freshwater  and salt water

Explanation:

There are three types of aquatic ecosystems that are lentic, lotic, and wetlands. Lentic ecosystems include slow-moving or non-moving water systems like pools, lakes, or ponds. The Lotic system on the other hand is aquatic systems with faster-moving water systems like the ocean or river also known as estuaries.

Wetlands are the system that has unique properties of having vegetation adapted according to the condition or situations on the water in saturated soil flood with water seasonally or permanent.

Aquatic system           organizers

wetlands     -               land and water

estuaries    -          freshwater  and salt water

Which correctly lists the three main ocean zones?
O deep, neritic, surface
O intertidal, deep, surface
O neritic, intertidal, open ocean
O open ocean, deep, continental

Answers

Answer:

Honestly I think it's C

Explanation:

The three main ocean zones are neritic, bathyal, and abyssal. Therefore, none of the statements are correct.

What are the three main zones?

The ocean is divided into three main zones which are the neritic zone. This zone is the shallowest zone extending from the shoreline to the edge of the continental shelf and is 200 meters deep.

The bathyal zone is the middle zone extending from the edge of the continental shelf to the abyssal plain and is 4,000 meters deep. The abyssal zone is the deepest zone extending from the abyssal plain to the ocean floor.

Apart from the three main ocean zones, there other oceanic zones are  epipelagic zone, mesopelagic zone, and hadal zone. The hadal zone is the deepest oceanic zone and is unique to highly adapted species of marine life and is important to study.

Therefore, the three main ocean zones are neritic, bathyal, and abyssal.

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help me please :( punnett squares

Answers

Answer:

17. A 100% purple

18. D 75% purple 25% white

19. D 100%

20. B If the trait is recessive, then it's B, because she fell into that 25% of recessive trait for blue eyes.

Explanation:

What would happen if you sweat while your body was cold?

A.positive feedback
B. Negative feedback

Answers

Answer:

I guess Negative Feedback

Explanation:

That's Rough Buddy

Answer:

negative feedback

Explanation:

you would probably have a fever :/

Why do molecules move across the membrane?

Answers

Answer:

because they help your brain produce the lack of energy it could be getting

Explanation:

Calculate the rate of photosynthesis (mm/hr) for Elodea if when measuring net photosynthesis, the water level moved up 3 mm from the initial level in 20 min, and when measuring cellular respiration it took 15 minutes for the water level to move down 1 mm.

Answers

Answer:

The rate of photosynthesis is 13 mm/hr

Explanation:

The rate of net photosynthesis is given by;

rate of net photosynthesis = 3 mm / 20 min = 1.5 mm/ 10 min

The rate of  cellular respiration is given by;

rate of cellular respiration = 1 mm / 15 min = 0.667 mm / 10 min

The rate of photosynthesis is given by;

rate of photosynthesis = rate of net photosynthesis + rate of cellular respiration

rate of photosynthesis = 1.5 mm/ 10 min + 0.667 mm / 10 min

rate of photosynthesis =2.167 mm/ 10 min

[tex]rate \ of \ photosynthesis \ in \ mm/hr = \frac{2.167 \ mm}{10 \ min} *\frac{60 \ min}{1 \ hr} = 13 \ mm/hr[/tex]

Therefore, the rate of photosynthesis is 13 mm/hr

Picture yourself around a campfire. Which of these would be an example
of convection?
A metal rod would not be a good choice for roasting marshmallows because metal transfers
thermal energy.
O As the air around the campfire is heated and becomes less dense, it rises and
moves upward.
A metal rod would not be a good choice for roasting marshmallows because
metal transfers thermal energy.

Answers

Answer:

O As the air around the campfire is heated and becomes less dense, it rises and moves upward.

Explanation:

This is true because, the convection transfer needs the particle of elements to transport the heat from where it is in abundance to where it is in less abundance. Just like a water boiling becoming hot at the point closer to the fire than the top of the pot, so also will the air around campfire transfer heated air from the place closer to the campfire to upwards aware from the fire.

Convection is the flow of air around the campfire when it is heated and the decrease in density as it rises upward in the atmosphere. Thus, the correct option is C.

What is convection of heat?

Convection is the transfer of heat from one place to the other due to the movement of fluids present in it. It is a distinct method of heat transfer in systems. The convective heat transfer involves combined processes of conduction and advection in a system and its surrounding. Convection is the dominant form of heat transfer in liquids and gases.

The thermal radiation in the fire is mostly in the form of infrared waves and visible light. However, the campfire heat transferred via convection shoots straight up in the sky and never reaches to the ground level.

Therefore, the correct option is C.

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Which of the following is TRUE about the fossil record? Group of answer choices It is sadly incomplete and lacking in all transitional forms. It gives useful information about environments and the ways past organisms lived. Only animals with hard skeletons are preserved. It is best in deep forests where dead organisms have not been disturbed.

Answers

Answer:

It gives useful information about environments and the ways past organisms lived

Explanation:

A fossil is basically any preserved remains or trace of any organism that once lived in the past. Bones, shells and exoskeletons are examples of fossils that can be studied through Paleontology.  

From fossil studies, we can tell how long these lives existed on earth and how varying plants and animals are related to one another. We can often find out how and the places they lived and their environments as well.  

Chlorophyll:
A)gives plants a brown color
B)is used by plants to make food
C)is soaked up from the soil by root hairs

Answers

Answer:

b: chloroplasts are used in photosynthesis

Explanation:

not a: cause chlorophyll makes plants green not brown

not c: cause its used in photosynthesis

BRAINLIEST APPRECIATED

THANK YOU!

Answer:
B. Used by plants to make food

Explanation:
Chlorophyll is found in chloroplasts inside of cells. It’s a green pigment and it absorbs sunlight. The sunlight that is absorbed is then used in the process of photosynthesis. Photosynthesis is used by plants, algae, and some bacteria. It produces glucose or sugar, which becomes food for the organism.

Therefore, the best choice is B. used by plants to make food.

For the number 8 where would the decimal be if there was a decimal

Answers

what ? is there a pic that goes with it bc i don’t get it where’s number 8
For the number 8, the decimal would be on the end. 8. Because 8 is 8.00

which of the following is not a human activity that speeds up erosion?
A)
rains
B)
farming
C)
urban development
D)
grazing


Please select the best answer from the choices provided

A
B
C
D

Answers

Answer:

I believe that A is the answer

It’s D overgrazing helps speed up Erosion it’s quickens the speed of natural erosion

Lactic acid and alcohol fermentation occur when _______?

Question 4 options:

cell death occurs


when no oxygen is present


a cell is subjected to too much oxygen


when the amount of glucose is not sufficient

Answers

Answer:

a cell is subjected to too much oxygen

Explain why the steroid hormone estradiol (MW 272) readily crosses membranes by simple diffusion but the much smaller H requires transport proteins

Answers

Answer:

Estradiol has a higher partition coefficient than H+ ions

Explanation

Estradiol is a non-polar and hydrophobic molecule that has a higher partition coefficient than H+ ions, it means that the cell membrane is more permeable to this molecule because it can dissolve in and diffuse within the hydrophobic phase of the membrane. The movement of polar charged molecules (even small H+ ions) requires the input of energy to be able to dissolve within the lipid bilayer. In consequence, the movement of H+ ions requires proteins capable of transporting these protons through the membrane.

Why is Earth called "the living planet?"

Answers

Answer:

Because earth is the only living planet which has environment, animals, plants and etc. Other planets don't have any oxygen. Earth has lands, water, oceans greenery.

Hope this helps you!

Explanation:

What characteristic properly describes glycogen?

Answers

Answer: What are the characteristics of glycogen?

It has a structure similar to amylopectin (a component of starch), but is more extensively branched and compact than starch. Both are white powders in their dry state. Glycogen is found in the form of granules in the cytosol/cytoplasm in many cell types, and plays an important role in the glucose cycle.

Explanation:

Why does photosynthesis occur at the upper surface of the leaf than the lower surface

Answers

Answer: The sunlight hits the upper surface of the leaf, and sunlight is crucial to the photosynthesis process. The leaves trap the energy and use it to create glucose.

How do you know if something is alive? Describe some of the characteristics of living things.

Answers

Answer:

We can determine if something is a living thing by seeing if they show some of the living characteristics. These characteristics include:

Reproduction - to make more of the same organism

Sensitivity - the ability to detect and react to stimuli

Nutrition - eat and digest food.

Movement - the ability to change its position or location

Respire - to breathe / gas exchange

Excretion - get rid of toxic / materials in excess

All living things show the characteristics above.  

For example, we can be sure that robots are not living things because they cannot excrete, respire, or reproduce even if they can move and sense stimuli from outside. We can also be sure that plants are living because they show all characteristics, even for movement, we don't obviously see that, but for example, they may grow towards a light source.

Answer:

To be alive organisms have to include all of the following:

- Made up of a cell or cells

- Has DNA

- Can reproduce

- Responds to the environment

- Grows and develops

- Exchanges energy

- Evolves

Explanation:

Prokaryotic and Eukaryotic cells are both alive because they contain all of the seven necessary characteristics listed above. Viruses are not alive because they do not contain all of the seven characteristics listed above.

Which examples of artificial selection are caused by human activity without people even realizing it?
a. an increase of tuskless Asian elephants because of ivory poaching
b. growing human organs from pig stem cells because of increased research on stem cell therapy
c. a decrease in rams’ horn size because of hunters’ preference for long-horned rams
d. cows producing milk with more protein because of genetic engineering
e. chickens producing more meat because of selctive breeding

Answers

an increase of tuskless Asian elephants because of ivory poaching, a decrease in rams’ horn size because of hunters’ preference for long-horned rams

Answer:

a,an increase of tuskless Asian elephants because of ivory poaching,

c,a decrease in rams’ horn size because of hunters’ preference for long-horned rams

Explanation:

Various cultures designate racial categories differently, and they often base these categories on very different traits. For example, some cultures use nose shape as one of the defining traits for a racial group. Other cultures do not use nose shape in defining racial groups, but use hair color instead. Conduct a survey in person on your campus, via social media accounts online, or among your friends and family. Ask at least 20 people what five traits they think are most important when distinguishing racial groups. Document the responses, and then review the data. Did every person use the same traits? What do differences in racial classification such as these suggest about the universality of race and racial groupings?

Answers

Answer:

In the clarification portion below, the definition of the topic is mentioned.

Explanation:

This shows that the distinctions between people living in a culture or geographical region are often based on ethnicity including ethnic groupings. A single population belonging to a specific geographical region has been shown to possess many characteristics, including hair color, body potential for heat resistance, and menu variety. In something like a specific race or ethnic group, these social traits bring them alongside, and the young government associated with a particular race is often obligated to answer the custom practiced by individuals related to such a particular demographic. These are assumed that understand the connection to a specific community follow these rituals only to solve difficulties they have previously faced due to errors perpetrated by certain ancestors.

what type of consumer is this organisms

D. The organism is not a consumer

Answers

Answer:

whiich consumer

Explanation:

Justify your answer.Your cousin tells you that trees have leaves to protect the tree from sun damage, just like a natural umbrella. Do you agree? Justify your answer.

Answers

Answer:

no

Explanation:

trees need sunlight to grow the leaves that is on the tree

In a given strand of dna the number of thymines

A. Is same as the number of uracils

B. Is double the number of guanines

C. Is double the number cytosines

D. Is the same as the number of adenines

Plz answer ASAP

Answers

D. Is the same number of adenines

Thymines and Adenines will always pair together.

:)

How are humans affected by population growth of other organisms in anarea?​

Answers

Answer:

yes

Explanation:

other organisms include things such as plants, insects and animals which can play a large role in the population. For example, if you have a sudden rise in the population of misquitoes that can be really bad since they can spread diseases to people when they are sucking blood. Antoher example is if there is a sudden growth of animals that eats a certain crop, then farmers will stuggle to maintain their crops and the list goes on. Hope this helps :)

In the figure, X is pointing to a building block of DNA. Which of these correctly labels X?

A. Amino acid
B. Nucleotide
C. Polysaccharide
D. Pyrimidine

Answers

Answer:

Nucleotide

Explanation:

I took the test and it was right.

The name of the building block of DNA that is depicted by X in the attached image is nucleotides.

DNA:

DNA or deoxyribonucleic acid is a biological molecule that stores genetic information in living cells.

DNA molecule is a biological polymer and hence, is made up of monomers called nucleotides. Nucleotide is the subunit of a DNA molecule.

Nucleotide is made up of three components namely: nitrogenous bases, phosphate group and pentose sugar.

In the image attached to this question, X is used to represent the building block of DNA, hence, it is a nucleotide.

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Explain how wildfires help restore soil nutrients to forest ecosystems.

Answers

Answer:

Wildfire help restore soil nutrients - Wildfire kills off the soil organisms that consume soil nutrients. Wildfires restore soil nutrients by decreasing the amount of underbrush in forests that contribute to nutrient loss. Wildfires break down organic material faster than decomposition, thus renewing soil nutrients more quickly.

Explanation:

Wildfire help restore soil nutrients by eliminating soil organisms that consume soil nutrients and decomposition of materials that help to renew soil nutrients.

What is soil nutrients?

Soil nutrients are essential ingredients needed by plants for growth, they include nitrogen (N), phosphorus (P) and potassium (K).

Some factor can impact on soil nutrients thereby reducing it.

How wildfire help to restore soil nutrients

Wildfire help restore soil nutrients in the following ways;

Decomposition of materials that renew lost soil nutrientsElimination of soil organisms that consume soil nutrients. Reduction of plants that contribute to nutrient loss.

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Why are carbon important to these molecules

Answers

Answer:

Hiya! ^^

Explanation:

Carbon's molecular structure allows it to form bonds with many elements, itself other carbon elements. Because of this, it can form long chain molecules, each having different properties. Carbon remains in balance with other chemical reactions in the atmosphere and water because of its stability.

Hope this helps! <3

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Find the value of each variable. The snacks belong to my brothers friends. The snacks are theirs or his Which detail from the beginning of part 1 of "For the Win" most supports the prediction that Dean will not properly care for his dogs during the race? From track and field to archery, Dean was always the winner, but that wasn't what bothered Jake. "Now Dean shows up to ruin everything," he thought as he checked his gear one last time. "Dean knows nothing about dogs. He simply spent a whole bunch of money to buy a top team and a fancy sled." The blog posts of the last week had only made matters worse. Jake and Dean were the two youngest mushers in this year's race . . . A car accelerates from 1.5 to 18 m/sec in 9.6 seconds. Calculate its acceleration. and the other one is During a race, you speed up from 2.2 m/sec to 4 m/sec in 3.2 seconds. (a) What is your change in speed? ____ m/sec (b) What is your acceleration? ___ m/sec2 Leach Inc. experienced the following events for the first two years of its operations: Year 1: Issued $10,000 of common stock for cash. Provided $78,000 of services on account. Provided $36,000 of services and received cash. Collected $69,000 cash from accounts receivable. Paid $38,000 of salaries expense for the year. Adjusted the accounting records to reflect uncollectible accounts expense for the year. Leach estimates that 5 percent of the ending accounts receivable balance will be uncollectible. Closed the revenue account. Closed the expense account. Year 2: Wrote off an uncollectible account for $650. Provided $88,000 of services on account. Provided $32,000 of services and collected cash. Collected $81,000 cash from accounts receivable. Paid $65,000 of salaries expense for the year. Adjusted the accounts to reflect uncollectible accounts expense for the year. Leach estimates that 5 percent of the ending accounts receivable balance will be uncollectible.Requireda. Record the Year 1 and Year 2 events in general journal form and post them to T-accounts.b. Prepare the income statement, statement of changes in stockholders equity, balance sheet, and statement of cash flows for Year 1 and Year 2. c. What is the net realizable value of the accounts receivable at Year 1 and Year 2? Jennifer jogged 4 milesevery day to train for arace. How many miles didshe run in 8 days? Showthe constant rate ofchange on the graphincluded on your answerdocument to prove youranswer. If a, b and c are positive integers for which (a,b,c) is the onlyordered triple such that 6a +9b + 20c = 61, then what isa+b+c? Hi GuysPlease answer this question. I will choose Brainliest.Also please do a step by step method.Worth 10 points and it is a Maths question.Cheers,Jake Someone helppppppppppppp lists the 4 states of matter from most amount of thermal energy to least amount of thermal energy? What is the fate of the products produced from photosynthesis List the following elements in order of INcreasing number of valence electrons: C, Cl, As, Na, He name the sets of numbers to which 7/9 belongs help pleaseeeeeeeeeeeeeeeee In a triangle, the measure of the middle angleis triple the measure of the smallest angle, andthe measure of the largest angle is 55 greaterthan the measure of the smallest angle. Findthe measures of theangles. Solve for f 7a - 3d + 6f = 5 In order to decrease their level of pollution, Jean and Rhonda decided to _______. a. ride the bus to work instead of walking b. drive separately instead of taking the train c. ride the train instead of riding their bikes d. carpool instead of driving separately Please select the best answer from the choices provided A B C D 0.39/0.75 as a decimal Helpppppp!!! PLEASE:(( solve the quadratic equation 3x^2-5x-7=0