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34kurt
2 years ago
14

What causes an increase in the number and intensity of small earthquakes before an eruption?

Biology
1 answer:
DiKsa [7]2 years ago
6 0
<span>Before an eruption, scientists look for gases and changes in the volcanoes shape, before an eruption the number and intensity of small earthquakes increases, this is caused by the movement of magma, prior to the eruption. Magma forms in the mantle and is a result of high temperature and low pressure.</span>
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The body sizes of sympatric and allopatric P. cinereus and P. hoffmani are consistent with a hypothesis of character displacemen
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Answer:

Option C - The sympatric salamander populations evolved their present body sizes after they became sympatric.

Explanation:

First, note the definitions of each terms.

1) Sympatric occurs when organisms especially of same species occurring in the same, or in overlapping territory, do not interbreed.

2) Allopatric occurs when organisms are NOT living in the same territory and thus unable to crossbreed.

On 1st QUESTION

The argument would be strengthened by the failure of P. cinereus and P. hoffmani to crossbreed making traits for body size to become distinct (dissimilar) in each specie.

On 2nd QUESTION

Definitely, salamanders species occurring in the territory, do not interbreed after they became sympatric, thus, making characters among same species to be increasingly different over generations.

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3 years ago
Most people experience increased infant mortalities at high altitudes. Explain how a mutation that allows normal levels of infan
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Answer:

Most people experience increased infant mortalities at high altitudes due to the inability of the mother to provide sufficient oxygen to the developing fetus but now variation in the DNA sequence in the people that lives at higher altitudes like in Tibetans allow normal level of infant survival at high altitudes.

This variation occurred in the EPAS1 gene in the Tibetan population that is responsible for delivering oxygen more efficiently to the fetus. This nucleotide variation is also present in low landers of Beijing but natural selection selected the variant gene in Tibetan people because they require this mutated gene for their survival.  

So the population passed this variant gene in next-generation, therefore, inheritance allowed the spreading of the mutated gene to the next generation therefore by natural selection and inheritance a mutated gene spread through a human population that had just begun living high in the mountains.

6 0
3 years ago
What the significant of meiosis ​
Zanzabum

Answer: Responsible for formation of reproduction cells/gametes

Explanation: Meiosis is significant because it makes sure that all organisms (which were produced via reproduction) contains the correct number of chromosomes. Also, Meiosis produces genetic variation by the process of recombination.

3 0
2 years ago
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Pachacha [2.7K]

Answer:

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Explanation:

The oceans get water in several different manners, with some of them being through precipitation, and through runoff. Whenever there is precipitation on the ocean waters, the water from it of course ends up in it, thus it accumulates it. Also, when there's precipitation on the land, a runoff appears. The runoff is simply the water from the precipitation that moves on the surface, downhill, and usually ends up in some water body. Part of the runoff ends up in the oceans, and that is the runoff that appears on the slopes that are near the ocean and are sloping toward the ocean waters.

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Answer:

A is your answer :)

Explanation:

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