The correct answer for above statement is:
<h3>A. coevolution</h3><h3>Explanation:</h3>
Coevolution is the method by which two or extra kinds emerge in tandem by exercising selection forces on each other. Coevolution happens when two or more species reciprocally influence each other's development.
<span>"they form a cyst: a hard covering is formed around the protozoan and metabolic rate is slowed"</span>
In this question, there are no options given to choose from. So i would answer this question based on my knowledge. The most likely cause of the observed variation is adaptation and evolution. The birds of that island adapted to the food source and then they evolved as per the requirement of the place and food source.
This reaction occurs in the thylakoids of the chloroplast
