It is called speciation.
So it'll be D. Speciation
Hope this helped :)
The answer to this question is true; contractions during childbirth are an example of positive feedback since they are given to a neurotransmitter known as
I believe the answer lies in the function and adaptive physiology towards the two anatomical different nerves. This correlates to their response and reaction to the present stimuli.
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Asymmetry is the lack of symmetry.