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harkovskaia [24]
3 years ago
15

Select all the correct answers.

Biology
2 answers:
Dmitry [639]3 years ago
5 0

Answer:

B they release oxygen that organisms use to breathe

NISA [10]3 years ago
4 0

Answer:

B) They release oxygen that organism use to breathe.

Explanation:

The process of this is called Photosynthesis. The plant takes in carbon dioxide and sunlight. The sun and water makes it possible for the plant to make sugars which are glucose which is the plant's food. And the byproduct of that is oxygen.

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The answer is A. Nucleotide
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Explain why a person at 14,000 ft would weigh less than a person at sea level, 0 ft.
Vaselesa [24]

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because gravity under water with put more weight on you causing you to sink but if you were falling you will be maintaining you weight while falling  

Explanation:

Your welcome

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PLEASE PLEASE HELP ME!!!! (10 POINTS!)
Oksi-84 [34.3K]

Answer:

 

en Espanol en Español     print print

Bottlenecks and founder effects

Genetic drift can cause big losses of genetic variation for small populations.

Population bottlenecks occur when a population's size is reduced for at least one generation. Because genetic drift acts more quickly to reduce genetic variation in small populations, undergoing a bottleneck can reduce a population's genetic variation by a lot, even if the bottleneck doesn't last for very many generations. This is illustrated by the bags of marbles shown below, where, in generation 2, an unusually small draw creates a bottleneck.

Loss of genetic variation as a result of a population bottleneck

Download this graphic from the Image library.

Reduced genetic variation means that the population may not be able to adapt to new selection pressures, such as climatic change or a shift in available resources, because the genetic variation that selection would act on may have already drifted out of the population.

Elephant seal

 

An example of a bottleneck

Northern elephant seals have reduced genetic variation probably because of a population bottleneck humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000 — but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.

Founder effects

A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have:

reduced genetic variation from the original population.

a non-random sample of the genes in the original population.

For example, the Afrikaner population of Dutch settlers in South Africa is descended mainly from a few colonists. Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington's disease, because those original Dutch colonists just happened to carry that gene with unusually high frequency. This effect is easy to recognize in genetic diseases, but of course, the frequencies of all sorts of genes are affected by founder events.

Explanation:

7 0
3 years ago
What is the difference in average speed between two cars that have traveled 150 km in five hours and the other traveled 130 km t
Aliun [14]

Answer:
The difference is 4 km

Explanation:

150 / 5 = 30
130 / 5 = 26

30 - 26 = 4 km

I hope this helped!

8 0
2 years ago
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Before dna was discovered in which materials did scientists think the genetic materials was stored?
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