The answer would be ( D. formation of cell walls)
Answer:
exoskeleton
Explanation:
An exoskeleton is the hard outer covering that supports and protects some animals without backbones.
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The correct answer is 4.) Eventually they become separate species
A process of formation of a new species from an existing species is called speciation.
When a single species changed into two or more separate species, is called speciation. Speciation can take place due to reproductive isolation. In reproductive isolation, the separated species no longer can interbreed among themselves. This is happened due to mating differences, sterility or environmental barriers which finally results into the adaptive splitting into two species.
Answer:pls no ban me only poor children
Explanation: