Answer:
Well Like humans, mice naturally develop diseases that affect these systems, including cancer and diabetes. Immunodeficient mice (mice without a fully functioning immune system) can also be used as hosts to grow both normal and diseased human tissue. This has been a useful tool in cancer and AIDS research.
Also for expermients many of there tissues are like humans so they get a result the same that a human would get as well.
Explanation:
Hope this helps!
Can somebody please help me with this question?
Answer:
Segmented Worm
Explanation:
What does an urn-shaped age pyramid represent? A. a stable population growth B. a low birth rate C. a low death rate D. a growing population
Answer: B
Explanation:
because it’s supposed to show a declining population
Answer:
B. a low birth rate
Which heart structure prevents blood from flowing backward? aorta valve septum coronary artery
Answer:
valve
Explanation:
valve is present in veins and other structures so as to prevent blood to flow backward
Answer:
The answer is valve.
Explanation:
Valve prevents the backflow of blood.
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an energy pyramid is a diagram that shows energy gain. true or false?
Answer:
True
i hope this helps
Select the correct answer.
A herd of sheep moves up the mountain to graze during summer, and migrates to the valley during winter. What type of migration do the sheep follow?
A.
one direction only
B.
seasonal movement
C.
daily movement
D.
one return journey
according to the article, what changed have occurred over the last twenty years to improve conditions on the galápagos islands? check all that apply
1. What is a disadvantage to living in a group?There could be less competition
It makes it easier to find a mate
There are more individuals to watch out for predators
There is an increased risk of parasitism and disease
Answer:
There is an increased risk of parasitism and disease
Explanation:
Answer:
There is an increased risk of parasitism and disease
Explanation:
I just had this question
The endomembrane system is composed of
Answer:
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Explanation:
vs vhg syzvcyufdzs dbshsf vcryesg
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Answer:
The endomembrane system (endo = “within”) is a group of membranes and organelles (Figure 1) in eukaryotic cells that works together to modify, package, and transport lipids and proteins.
Which type of map is most likely to focus on boundaries between countries, states, and counties?
Answer: Political map
Explanation:
Answer:
Political map
Explanation:
A political map is most likely to focus on boundary lines. Topographic, physical, and geologic maps may show boundaries, but these boundaries aren't usually the focus of the map.
Help please. I posted a picture of the question and answer choices.
Answer:
its b i think
Explanation:
its not c for sure and
A scientist set up an experimental ecosystem in a sealed room with no windows. The experimental ecosystem has plants, and animals that eat those plants. The scientist can control whether the room is light or dark with a light switch outside the room.
The amount of carbon in the air of the ecosystem started out low. Then the amount of carbon in the air started to increase. Is the increase because the scientist switched the light on or because she switched the light off? What happened to the number of energy storage molecules in the living things?
The scientist . . .
a
switched the light off, and the number of energy storage molecules in the living things decreased.
b
switched the light off, and the number of energy storage molecules in the living things increased.
c
switched the light on, and the number of energy storage molecules in the living things increased.
d
switched the light on, and the number of energy storage molecules in the living things decreased.
Answer:
Option-A
Explanation:
In the given question, the artificial ecosystem was prepared by the scientist which included the animals and plants. The light and dark conditions were controlled by a switch and bulb.
In the beginning, the amount of Carbon in the form of carbon dioxide was low due to the utilization of carbon dioxide by plants to perform photosynthesis. Then the amount of carbon dioxide increased in the atmosphere, the reason could be due to less consumption of carbon dioxide. The carbon dioxide is not uptake by plants during night conditions when photosynthesis process slowed down or stops.
Therefore, the dark condition was created by the scientist by switching off the lights and the number of energy molecule decreased as no photosynthesis was occurring.
Thus, Option-A is the correct answer.
Answer:
A
Explanation:
Which materials are excreted through sweat glands in the skin?
Answer:
carbon dioxide, hydrogen, and water
salt, urea, and water
urine, alcohol, and water
fats, ammonia, and water
Answer:
Not A absolutely not A
Explanation:
What is the correct term for the point at which the maximum rate of oil extraction is reached?
The point at which the maximum rate of oil extraction is reached is called _______.
Answer:
peak oil
Explanation:
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What are causes of climate change?
please elaborate : ) thank you!
why does our planet appear blue?
Answer:
Mars is the red planet; the Moon is an ashy grey; Saturn shines yellow and the Sun is a brilliant, blinding white. But our planet, when seen from the depths of space, whether we rise up above our world only slightly, in low-Earth orbit, or whether we travel to the outer reaches of our Solar System, shines a glorious blue.
Explanation:
Water vapor. The most abundant greenhouse gas, but importantly, it acts as a feedback to the climate. Water vapor increases as the Earth's atmosphere warms, but so does the possibility of clouds and precipitation, making these some of the most important feedback mechanisms to the greenhouse effect.
Carbon dioxide (CO2). A minor but very important component of the atmosphere, carbon dioxide is released through natural processes such as respiration and volcano eruptions and through human activities such as deforestation, land use changes, and burning fossil fuels. Humans have increased atmospheric CO2 concentration by more than a third since the Industrial Revolution began. This is the most important long-lived "forcing" of climate change.
Methane. A hydrocarbon gas produced both through natural sources and human activities, including the decomposition of wastes in landfills, agriculture, and especially rice cultivation, as well as ruminant digestion and manure management associated with domestic livestock. On a molecule-for-molecule basis, methane is a far more active greenhouse gas than carbon dioxide, but also one which is much less abundant in the atmosphere.
Nitrous oxide. A powerful greenhouse gas produced by soil cultivation practices, especially the use of commercial and organic fertilizers, fossil fuel combustion, nitric acid production, and biomass burning.
Chlorofluorocarbons (CFCs). Synthetic compounds entirely of industrial origin used in a number of applications,
You might have heard that the ocean is blue because the sky is blue, and water reflects the skies. Well, the sky is blue; that’s for certain. And the sky is blue because our atmosphere is more efficient at scattering blue (shorter-wavelength) light than red (longer-wavelength) light. This is the reason why the earth looks blue in color.
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According to your data, which cell was most successful at receiving the needed nutrient (food coloring) in the allowed time?
Answer:
Can you show data please
Explanation:
The skin functions as part of the ______ system because it provides a physical barrier that prevents microorganisms from entering the body.
Answer:
immune system
Explanation:
Immune system protects us from pathogen and harmful organisms that enter our body. Skin is the largest organ in our body and covers every inch of us thus it prevents pathogens from directly entering our organs or body acting as a part of immune system.
On a phylogenetic tree, what do the branch lengths represent?
The age of the organisms
amount of genetic change since divergence
amount of genetic change since convergence
The age of divergence
Answer:
the evolutionary time between two nodes
Explanation:
Branch lengths indicate genetic change i.e. the longer the branch, the more genetic change (or divergence) has occurred
Which situation below would have the strongest gravitational force between them?
A 10 kg mass and a 10 kg mass at 30 km apart.
A 2 kg mass and a 2 kg mass at 10 km apart.
A 10 kg mass and a 10 kg mass at 10 km apart.
A 10 kg mass and a 2 kg mass at 30 km apart.
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What are 5 ways carbon dioxide is released into the environment?
What is the role of decomposers in the carbon/oxygen cycle?
How do humans impact the carbon/oxygen cycle
Answer:
Explanation:
*organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes
*In terms of this cycle, the decomposers metabolize oxygen and release carbon dioxide. The primary producers then use these nutrients to fuel photosynthesis, which provides oxygen for the consumers
*burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.
Fruit flies feed on decomposing fruit.
The smell of the fruit attracts the fruit flies.
Design an investigation to find out if the smell of decomposing apples attracts fruit flies more than the smell of decomposing bananas.
Include experimental details in your answer and write in full sentences.
(6)
Please someone help i will give you full ratings
Answer:
Hypothesis: the smell of decomposing apples may attract fruit flies more than the smell of decomposing bananas.
Experiment: two separated fruit fly populations with a sample size statistically significant (N: 500 or higher) must be grown in clean boxes. Subsequently, the fruit fly populations should be simultaneously released in a tube that connects the two boxes with other two boxes containing: -Box 1: apples in decomposition and -Box 2: bananas in decomposition. After one hour, the fruit boxes must be simultaneously closed and the fruit flies must be counted. Finally, it is necessary to apply a statistical index in order to calculate the significance between groups (i.e., fruit flies closed in both fruit boxes).
Positive control: fruit flies released and counted in boxes containing apples and bananas in normal conditions.
Negative control: fruit flies released and counted in clean boxes.
Theory: the scent of breaking down apples may draw in natural product flies more than the scent of breaking down bananas.
Experiment:
Two isolated natural product fly populaces with a test measure measurably critical (N: 500 or higher) must be developed in clean boxes.
Hence, the natural product fly populaces ought to be at the same time discharged in a tube that interfaces the two boxes with other two boxes containing: -Box 1: apples in deterioration and -Box 2: bananas in decay.
After one hour, the natural product boxes must be at the same time closed and the natural product flies must be checked.
Positive control: natural product flies discharged and tallied in boxes containing apples and bananas in ordinary conditions.
Negative control: natural product flies discharged and numbered in clean boxes.
Experimental DetailsExperimental information are collected through dynamic mediation by the analyst to create and degree alter or to make distinction when a variable is modified.
Test information regularly permits the analyst to decide a causal relationship and is ordinarily projectable to a bigger populace.
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Select all that apply.
Cyanobacteria
serve as a food source for other organisms
are used for medicinal purposes
produce oxygen
perform nitrogen fixation
cause disease
Answer:
Its A . serve as a food source for other organisms .
Explanation:
hope it helps
Answer:
Yes . the correct one is serve as a food source for other organisms.
Explanation:
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Which of these DOES NOT affect the carrying capacity of an ecosystem?
1.variety of different food
2.total amount of food
3.competition for food
4.food being available over time
Science Riddle of the Day: Whats The Most tiniest Virus Ever?
Answer:
The smallest viruses are thought to be the Porcine Circovirus.
Explanation:
How does heart rate change during and after an exercise is performed for two different periods of time?
Answer: During exercise, your heart usually beats faster to deliver more oxygen to your body cells at a faster rate while after an exercise your heart rate will typically drop as soon as the heart start to rest
Explanation:
Can you please tell me 2 advantages and 2 disadvantages of tearing down old
houses in the middle of a city to create a park.
Extra points and braniest will be given.
Answer:
Advantages: you have more space, and you can build more easily a park.
Disadvantages: people might die when you tear it down, and you need to pay a whole bunch of money .
Explanation:
Salt marsh, Atlas, and Indianmeal are three types of what insect?
Answer:
Aquatic Insects I believe
Explanation:
House sparrows from England were released in the United States. They have competed with native bluebirds. These house sparrows are __________.
Answer:
House sparrows from England were released in the United States. They have competed with native bluebirds. These house sparrows are invasive species.
Explanation:
House sparrows are invasive species that were introduced in the United States and once established these birds started to compete with native species and managed to displace many native birds. They seriously affected farmlands. Now they are everywhere always associated with human being presence.
Biologic Invasive species: It refers to new species that disperse and establish in a new area far or out of their original distribution range. Once established, these species expand their distribution from the first invaded spot and overgrows. As they expand, they compete with other species for resources, such as food sources, water, shelter, radiation, exposure, among others. Species are considered to be invasive because of their high reproductive rate, population growth, and interaction with native species, which provokes huge damages in the native ecosystems. It is very common for these species to scape and start new populations in the new area, where they have less environmental pressure and better conditions than in their origin area -fewer predators, more resources, better nitches-, and these factors favor their establishment.
There are some typical steps in an invasion process:
1) Introduction or dispersion to the new area,
2) Naturalization. The new species establishes in the new area. It can grow, reproduce, and make use of resources.
3) Overgrowth and uncontrolled expansion.
4) Interaction with other species.
5) Stabilization.
In some cases biologic invasions are natural processes, that occur in small groups of individuals that can expand to other ecosystems, and the appearing or despairing of barriers promotes their expansion. But these biologic invasions have been accelerated by human beings, referring to this as "human-assisted invasions".
During photosynthesis, plants take in carbon dioxide, water, and energy from
the sun and produce carbohydrates and oxygen. Which of the following
statements best explains how plants follow the law of conservation of mass
during photosynthesis?
Answer:
a
Explanation:
The diagram below shows fossils in three layers of rocks.
Picture shows three layers of rocks labeled Layer A, Layer B, and Layer C from bottom to top. Each layer of rock has a fossil.
Which of these conclusions is most likely correct about the organisms found in the layers of rocks?
The organism in Layer A is more complex than the organism in Layer B.
The organism in Layer B is more complex than the organism in Layer C.
The organism in Layer C is a modern form of the organism in Layer B.
The organism in Layer A is a modern form of the organism in Layer B.
Answer:
c
Explanation:
not sure about what does complex means, but if we according on theory of superposition - the top layer of rocks is younger than bottom
it means that the toppest layer is modern
We can observe three strata of fossil-bearing rocks in the diagram. We must take into account the idea of fossil succession in order to determine the conclusion regarding the organisms identified in these layers.
The theory of fossil succession holds that fossils found in rock layers are placed in a specific order. The oldest fossils are found in the bottom layers, while the youngest fossils are found in the top layers, which represents the relative ages of the fossils.
The conclusion that "the organism in Layer C is a modern form of the organism in Layer B" is most likely accurate based on this premise. As a result, the creature in Layer C reflects a more recent or evolved form of the organism in Layer B and existed before the organism in Layer B.
Overall, the concept of fossil succession aids in our comprehension of the relative ages and evolutionary connections of the creatures found in various rock layers.
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Herpes is categorized as a
A)bacterium.
B)mold.
C)spore.
D)virus.
Answer:
D
Explanation:
Herpes simplex viruse
Answer:
D Virus
Explanation: