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aivan3 [116]
3 years ago
8

The _______________ completely covers the surface of the protoplasm.

Biology
1 answer:
Ratling [72]3 years ago
7 0
The plasma membrane completely covers the surface of the protoplasm.
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Consider the evidence that explains how physical separation of two populations of a species can cause speciation. What effect do
Tom [10]

Answer:

  • Interruption in the genetic flow between separated groups
  • The emergence of new mutations in each of the groups, and their accumulation in time. Slow and gradual differentiation between populations.
  • Genetic divergence by natural selection and reproductive isolation
  • Prezigotic isolation mechanisms

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background that can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new groups that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

The process of allopatric speciation involves different steps that affect organisms:

  • The emergence of the barrier.
  • Interruption in the genetic interchange
  • The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
  • Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
  • Prezigotic isolation mechanisms will be favored by selection if occurs a secondary contact between the new species in formation.
4 0
2 years ago
The controlling structure of the cell that directs reproduction and determines structure and function of the cell is the
Phantasy [73]
The answer you are looking for is nucleus
3 0
3 years ago
During respiratory compensation of metabolic alkalosis
antiseptic1488 [7]

Answer:

a. and e.

Explanation:

Metabolic alkalosis would cause slower and shallower breathing which increase carbon dioxide concentrations which in turn are consumed to form carbonic acid which helps decrease the pH.  

3 0
3 years ago
The histogram shows the worldwide population densities of killer whales, or orcas, distributed by latitude. According to the gra
shutvik [7]

The correct answer is - Most killer whales congregate in the areas that are near the Arctic/Antarctic Circles.

The killer whales have a very large distribution, and they can be found in all oceans, apart from the Southern Ocean. It is noted though that the population density of the killer whales differs from place to place. The higher concentrations are found around the Arctic and Antarctic Circles, where there's cool rich waters, while in the lower latitudes they are much rarer. The reason for this probably lies in the fact that most of the animals that are considered to be the prime food source of the killer whales are living in this rich cold waters.

5 0
3 years ago
What is used to measure the volume of a solid with an irregular shape
laila [671]
Displacement is usually the method that is used to measure the volume of a solid with an irregular shape
6 0
3 years ago
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