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liraira [26]
3 years ago
5

What gas do some scientist think was missing from earths early atmosphere

Biology
1 answer:
salantis [7]3 years ago
3 0
I think the answer is oxygen, but not 100% sure
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In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous
Nimfa-mama [501]
According to Mendel's Theory of Genetics all 4 options arepossible´-
RR, Rr, rR,and rr,
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3 years ago
What happens to the kinetic energy of a snowball as it rolls across the lawn and gains mass.
Lunna [17]
Kinetic energy of a snowball will increase as it <span>rolls across the lawn and gains mass. We already know that Kinetic energy is directly proportional to speed. We can express kinetic energy by the formula 
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8 0
3 years ago
Read 2 more answers
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
Which organs send chemicals to the small intestine to help digest food?.
UkoKoshka [18]

Answer:

pancreas

Explanation:

Your pancreas makes a digestive juice that has enzymes that break down carbohydrates, fats, and proteins. The pancreas delivers the digestive juice to the small intestine through small tubes called ducts. Liver. Your liver makes a digestive juice called bile that helps digest fats and some vitamins.

7 0
2 years ago
Smog complex is: an atmospheric condition during which a warm layer of air stalls above a cool layer the precipitation of acidic
Eduardwww [97]
A condition associated with smog that causes eye irritation, irritation of the respiratory tract, and chest pains.

Hope this helps!

-Payshence xoxo
5 0
3 years ago
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