help.. How long will it take three quarters of a sample of a radioactive
element to decay if its half-life is 4 days?
a. 2 days
b. 3 days
c. 4 days
d. 8 days

Answers

Answer 1
3 days is how long it will take

Related Questions

Match all of the planets and the asteroid belt with their distance from the Sun.

Answers

Answer:

Mercury,Venus,Earth,Mars,Asteroid belt,Jupiter,Saturn,Uranus,Neptune

Explanation:

Mercury,Venus,Earth,Mars,Asteroid belt,Jupiter,Saturn,Uranus,Neptune

HELP ME
Match each description with the appropriate type of thermal energy transfer from
the following list. Place your answer in the blank space given.

i. radiation ii. convection iii. conduction
a. requires direct contact between substances at different temperatures
b. based on currents flowing in fluids

Answers

Answer:         (A) = Conduction

                       (B) = Conduction

Explanation:

How does the digestive system interact with the circulatory system?

A.
Oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.
B.
Nutrients and gases are absorbed by organs in the circulatory system. Then, they are transported to all parts of the body by organs in the digestive system.
C.
Nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system.
D.
Messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system.

Answers

Answer:

C

Explanation:

I just had the test

Explain the significance of the increased cell specialization of the volvocine line

Answers

Answer:

Well, I cannot see your list of suggestions but I am assuming one of them would be muscles.

Muscles use a lot of energy and require a large number of mitochondria.

Explanation:

Give example of SUTAINABLE USE and UNSUSTAINABLE USE of ANY 4 OF THE FOLLOWINGS: Water, Waste, Food, Paper, Energy, Plastic

Help would be really appreciated! Best answer will be marked as brainliest(so try your best)!

Answers

water -
sustainable use is: water systems in the realm of sustainable development may not literally include the use of water, but include systems where the use of water has traditionally been required. Examples include waterless toilets and waterless car washes, whose use helps to alleviate water stress and secure a sustainable water supply
-
unsustainable use is: world's water use may be unsustainable. ... These practices can have an important influence on what scientists call “evapotranspiration,” which is water that is lost to the atmosphere by either evaporating from the Earth's surface or being taken up by plants and later released into the air through their leaves.

food -
sustainable use is: Local & seasonal,
Organic & sustainable farming,
Reduce foods of animal origin & maximise welfare standards,
Excludes fish species identified as at risk,
Fair-trade-certified products,
Promote health and well being,
Food democracy and
Reduction of waste and packaging
-
unsustainable use is: Foods containing high fructose corn syrup (HFCS) are especially bad for the environment. Not only does consumption of HFCS increase the likelihood of obesity and health problems, but production is extremely energy intensive,
Seafood listed in the “avoid” column on the Seafood Watch list and
Factory farmed beef.

plastic -
sustainable use is: Renewable feedstock. Organic materials such as starch and other natural fibers can replace petroleum-based feedstocks, greatly reducing the reliance on carbon-dioxide-emitting fossil fuels,
Reclaimed feedstock,
Recycled feedstock and
Biodegradable materials.
-
unsustainable use is: plastic forks and knives,
plastic shopping bags,
plastic coffee cup lids,
plastic water bottles,
Styrofoam and plastic take out containers,
and, of course, plastic straws.

energy -
sustainable use: renewable energy sources like solar, wind, geothermal, hydropower and ocean energy are sustainable as they are stable and available in plenty.
-
unsustainable use: Most non-renewable energy sources are fossil fuels: coal, petroleum, and natural gas and
Plants, algae, and plankton grew in these ancient wetlands.

hope this helps :)

an example of a density dependent limiting factor is...

A) an avalanche

B) The amount of available food

C) a sudden flood

D) a decrease in water due to drought.

(please don't guess)

Answers

An example of a density-dependent limiting factor is the amount of available food. Thus, the correct option for this question is B.

What is a density-dependent factor?

Density-dependent factors may be defined as those factors that may significantly vary with the density of the population. These factors may affect a higher proportion of individuals when population densities are higher and a lower proportion when the population is lower.

Examples of these factors may effectively include food, competition, predation, parasitism, accumulation of toxic wastes, etc. While options like a sudden flood, a decrease in water due to drought, etc. may include examples of density-independent factors.

Therefore, an example of a density-dependent limiting factor is the amount of available food. Thus, the correct option for this question is B.

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Look at the bean from Days 4-6. Use these data to explain how natural selection changed the number of dark red walking beans over time.

Answers

Answer:

When the volcano erupted, the dark red walking beans were easier to see. Thus, more dark red beans were eaten during days four, five, and six. If the pollution continued, there would be fewer and fewer dark red walking beans over time.

Natural selection changed the number of dark red walking beans over time because, after the volcanic eruption, the dark red beans were clearly visible to predator's eyes; hence, they were picked and eaten by them. As a result, their population decreases.

What is natural selection?

Natural selection is applied to nature where the environment selects animals and plants that it wants to keep, and this is the result behind diversity in the different ecosystems. The availability of resources in nature prevents the desert from having the same diversity as the tropical rain forest. Nature selects the organisms that are best suited to the environment and reproduces to produce future generations.

Here, the dark red beans were not initially visible, but they became readily visible after the volcanic eruption, which let the predator see them and eat them. Slowly, due to this, their population declines, and this happens due to natural selection.

Hence, as the dark red beans are clearly visible to predators' eyes, and their population is declining.

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What are abiotic factors? List at least 3 in the environment

Answers

Answer:

In biology and ecology, abiotic components or abiotic factors are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems. Abiotic factors and the phenomena associated with them underpin all biology.

Five common abiotic factors in the enviroment are atmosphere, chemical elements, sunlight/temperature, wind and water.

hope it helps : D PLEASE MARK ME BRAINLIEST

Explanation:

What do you think the pH of water is?

Answers

The pH of pure water is considered to be neutral so it has a pH of 7. However, if you have water that falls below this range, the solutions or substances are considered to be be more acidic than than normal water. On the other hand, if you have water above 7, it is considered alkaline or basic.

In the process of distillation, during condesation the temperature of water decreases Hence absorption of CO2 takes place and some H2CO3 is formed. This is an acid (though very weakly) so water turns acidic. Double distillation enhance this so theoritical pH is 7.0 but practically less than 7.0 (6.2 to 6.8)

help.. Approximately what percentage of our tropical rain forests have
already been destroyed?
a. 10 percent
b. 20 percent
c. 50 percent
d. 60 percent

Answers

60%

hope this helps :)

(if you wouldn’t mind can you mark me brainliest?)

60% of our tropical rain forests have already been destroyed.

What are the functions of tropical rain forests?

Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm.

Tropical Rain Forests are found in warm and humid areas with annual precipitation of over 200 cm and mean annual temperature above 22 degrees celsius.

Tropical rainforests are forests with tall trees, warm climates, and lots of rain. In some rainforests it rains more than one inch nearly every day of the year.

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what is happening during each cycle of PCR?

Answers

PCR is shorthand for a simple but very useful procedure in molecular biology called the polymerase chain reaction. It is a technique used to amplify a segment of DNA of interest or produce lots and lots of copies.
A DNA polymerase enzyme joins free DNA nucleotides together. ... The result of one cycle of PCR is two double-stranded sequences of target DNA, each containing one newly made strand and one original strand. The cycle is repeated many times (usually 20–30) as most processes using PCR need large quantities of DNA

hope this helps :)

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where does partly digested food go after it leaves the stomach

A) esophagus
B) Appendix
D) small intestine
C) large intestine​

Answers

The answer is D) Small intestine

Use the drop-down menus to complete each sentence.
А
is an organism that eats other organisms to gain energy; it is also called
A
is an organism that makes its own food; it is also called
is an organism that breaks down waste and dead organisms.


Please help I will try to mark u as brainliest

Answers

1. Carnivore
2. Producer
3. Decomposer

Answer:

consumer

a heterotroph

producer

an autotroph

decomposer

Explanation:

I got it right

do you know why bananas are curved

Answers

Answer:

Because they grow towards the sun

Explanation:

brainliest pls :)

Answer:

They do this because bananas are negatively geo-tropic.

Explanation:

Hi, let me elaborate: This means that they grow away from the pull of gravity because of mass, as opposed to turning upward toward the sun.

When true-breeding tall plants are crossed with hybrid tall plants,
the offspring are
a. all tall plants
b. all short plants
c. some tall and some short plants
d. not enough information has been given to answer this question

Answers

Answer:

a. all tall plants

Explanation:

The gene that makes the plant tall is dominant

a mimic octopus has lost some of its arms, and is in the process of regeneration. Describe a scenario where this ability would provide the octopus an advantage in its environment.

Answers

Answer:A shark tries to eat an octopus they fight but the octopus ends up victorious. The shark only got away with one tentacle,

But fortunately for the octopus it will grow back.

The ability of the octopus arm to regenerate is an advantage in the case of

interaction with larger predators.

The octopus is a marine organism which is characterized by the eight arms.

It uses these structures to find food for its survival. The octopus are eaten by

larger predators such as shark, whale etc.

During the interaction with these large predators, there is a possibility of its

arms being eaten alone instead of its whole body which provides it with the

advantage of survival and regeneration of arms for subsequent finding of

food.

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The ability for one substance to dissolve into another is
a) Dissolvability
b) Solubility
c) Solvent
d) Solute

Answers

Answer:

b)solubility

Explanation:

Hope I helped

:D

b) solubility
hope this helps :))

Identify the structures of the digestive system labeled on the diagram to the right. Label F Label G Label H Label I Label J Structures of the digestive system are labeled. Part F is the large organ above and to the left of the stomach. Part G is a tiny organ near the pancreas. Part H is the large intestine. Part I is the rectum. Part J is the anus.

Answers

Answer:

First choice answers :

Label A - Pharynx

Label B - Esophagus

Label C - Stomach

Label D - Pancrease

Label E - Small Intestine

Second choice answer :

  Label F- liver

Label G- gallbladder

Label H- large intestine

Label I- rectum

Label J- anus

100% got them all correct :)

Answer:

liver - Label F

gallbladder - Label G

large intestine - Label H

rectum - Label I

anus - Label J

Explanation:

The answers were already stated in the question, but this is for anyone who may have overlooked it :)

which body system is responsible for transporting blood to other parts of your body?

Answers

Answer:

The circulatory system is responsible for transporting blood with oxygen (O2) from the lungs to cells and then transporting blood with carbon dioxide (CO2) back to the lungs. It also has to distribute nutrients from the digestive system to the cells in the body and remove waste products to be excreted.

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Explanation:

What did Joseph Lister discover ?

Answers

Answer:

listerine

Explanation:

lister listerine had to name it after himself.

carbolic acid - this is what google says

hi my sky betteljust

Answers

Answer:

pls mark brainliest pls I need one more

Explanation:

what is the formula for Glucose

Answers

Answer: Glucose also called dextrose one of a group of carbohydrates know as simple sugars.

Answer:

Explanation:

C₆H₁₂O₆

?

The rectal thermometer is the BEST instrument to use when

Answers

Answer:

Taking the animals temperature

Explanation:

Rectal temperatures are more accurate so they might also be used in someone who has severe hypo- or hyperthermia to obtain a more accurate core temperature. ... If someone has a heart condition, inserting a rectal thermometer can stimulate the vagus nerve and cause heart arrythmias (irregular heart beats).

Have a great day

How can organisms become endangered or extinct due to human activities?

Answers

Answer:

they shoot and kill and also we use hurtful acid and are killing them

We killed dem lololololololololololl

What is one similarity between the lungs and capillaries?

Group of answer choices

They are both activated by inhalation.

They are both involved in gas exchanges.

They are both part of the circulatory system.

They are both regulated by the heart.

Answers

Answer: Its B because Arteries deliver oxygenated blood to the capillaries, where the exchange of oxygen and carbon dioxide takes place.

Answer:

B

Explanation:

Just took the test

How long does adaptation usually take? (Plant)
1.a decade
2.an hour
3.A few days
4.Centuries

Answers

Answer: The answer is (4), centuries

Explanation:

Plant adaptation is a long-term process that occurs over many generations. It is driven by natural selection, which is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce. Hence option D is correct.

The rate of plant adaptation can vary depending on the environment and the plant species. However, it is generally a slow process that takes many years or even centuries to complete.

For example, some plants have adapted to the cold temperatures of the Arctic over millions of years. These plants have developed thick, waxy leaves that help to insulate them from the cold, and they have also developed a slower metabolism that allows them to conserve energy.

Other plants, such as weeds, can adapt to new environments more quickly. This is because weeds are often generalists, meaning that they can survive in a wide range of conditions. They can also reproduce rapidly, which allows them to quickly spread to new areas.

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what is the number of chromosomes in body cells, if in germ cells that number is n?​

Answers

Answer:it contain 23 pairs of chromosomes,germ cells only have half the number of chromosomes as a diploid  cell

Explanation:

If Julie used a syringe on her gelding she is MOST likely

Answers

Answer:

Giving an injection or drawing body fluids

Answer:

Giving an injection or drawing body fluids.

Explanation:

Purpose to create gemetes

Answers

Answer:

Gametes are cells used during sexual reproduction to produce a new individual organism or zygote.

Explanation:

This is helpful if male ejaculation is not possible, or insufficient.

The diameter of the large intestine is larger than that of the small intestine, and the large intestine is also longer than the small intestine. True or False.

True.
False.

Answers

Answer:

False

Explanation:

the small intestine is both larger and longer than the big intestine.

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Explain effect of climate change? Solve 9x2 + 6 = 12x who controlled fort wagner on the day after the assault by the 54th massachusetts regiment? What is the oxidation state of nitrogen in N2?O A. +5O B.-3O C. +3O D.O Which detail should be removed from the summary?This story is about how ants learned to work hard. A long time ago, MotherNature created ants and instructed them to work together. Mother Nature alsoinstructed other animals to work together. The ants refused to obey MotherNature's guidelines and became very weak. In order to get better, the antsworked together to find Mother Nature. Mother Nature agreed to heal the antsif they worked hard, which is why ants work hard today.This story is about how ants learned to work hard.O Mother Nature also instructed other animals to work together.O The ants refused to obey Mother Nature's guidelines and becamevery weak..Mother Nature agreed to heal the ants if they worked hard, whichis why ants work hard today. 1. Read the section "Fighting Between the North and SouthSelect the sentence that shows that peace was a major objective at the start of theKorean War.A. By this time the Soviet Union already had troops in North KoreaB. Both sides wanted to limit conflicts between them.C. Many Koreans were unhappy with how their country was being run.D. Finally in 1948, U.N. sponsored elections took place. b. How might more species diversity within a community make it more stable, even if it lacks geneticvariation? Consider species interactions and the flow of matter and energy in your answer. (2 points) Whats the area of the triangle ? Create an alternate ending for hey come on out? in there pasage made out of meatin paragraph 49 what waS the central idea Determine the volume of a sphere with a 20 inch diameter. Use 3.14 for pi What danger do the lotus-eaters pose to Odysseus men in the excerpt from the odyssey Which of the following is the best definition of Genetics?a.The passing of traits from parents to offspringb.A child can get different forms of a trait from their parentsc.The study of how traits are inherited through the interaction of allelesd.The study of how one trait can pass down through the generations What happens first during cellular respiration?A. The movement of small organic molecules into a mitochondrial B. The breakdown of food molecules into smaller organic moleculesC. The formation of many molecules of ATPD. The breakdown and small organic molecules into carbon dioxide Based on the pattern of reflections shown below, which of the following statements must be true? A. The mirror is a plane mirror that is tilted at an angle to the vertical. B. The mirror is a plane mirror that is exactly vertical. C. The mirror is not a plane mirror. D. None of the above are definitely true. Choose the correct simplification of the expression (4x3y2z4)(2x3y4z3) Alan walked 6.8 kilometers to his friends house. What is the distance in meters? Howcan organisms become endangered or extinct due to human activities? in a play, information about characters motivations and character traits comes from the a) dialogueb) set and props c) stage directions d) audiences imagination Texas who wanted to get rid of republican leaders after reconstruction called themselves ______.