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mario62 [17]
3 years ago
8

SCRIE UN ESEU CU TEMA UN OM SANATOS - UN OM FERICIT(AM NEVOIE URGENT)

Biology
1 answer:
LenKa [72]3 years ago
4 0
Sorry I only speak English and Spanish
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___ energy is how much energy is required to start a reaction.
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Activation Energy

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Please help me here the picture
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by using half to balance the equation

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Which of the objects is producing the greatest force? PLEASE HELP GUYS!
Artemon [7]

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Raquetball

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why because it is moving tthe least distance for lots of speed

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How specifies that are separated for a river, rocks, mountains, forest ; can at some point not being able to interbreed anymore
Allushta [10]

Answer:

Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background giving 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 flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

Vicariance is the geographical separation of an original population into two or more new groups. Discontinuities in the physical environment like rivers, mountains, water, etc., are physical barriers that impede genetic flow between the separated groups.

The process of allopatric speciation involves different steps:  

  1. The emergence of the barrier.  
  2. Interruption in the genetic interchange
  3. The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
  4. Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.  
  5. Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.

8 0
2 years ago
In the illustration below, label X is pointing to the A. antigens B. antibodies C. antigen-binding sites D. interferons In the i
12345 [234]

Answer:

The correct option is C: antigen-binding sites

Explanation:

The antibody is shaped much like the letter Y in the English alphabet. It has two antigen binding sites that are identical in nature. The specificity of these sites is determined by the amino acid sequence that makes it up. Antibodies are complementary to these antigen binding sites, and the antibodies have an incredible ability to recognize a great variety of antigens.

Hope that answers the question, have a great day!

6 0
3 years ago
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