The theory of proposed that sudden and widespread disasters that result in mass extinctions followed by repopulation could explain why species change over time.

Theory of Catastrophism

Explanation:

Catastrophism basically means Disaster.According to Theory of Catastrophism, quick and widespread disasters lead to mass extinction (extinction of large number of species over time) followed by re-population after a notable period of time.This theory was given on the Basis of Paleontological (Fossil Study) EvidenceFossil Study - can be called a the procedure being followed to study ancestral human beings (Neanderthals), animals (dinosaurs) and plants by the means of soil study till depth.

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The answer is a: the eggs have half as many chromosomes as the body cells