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(a) In a punctuated module, new species change most as they branch from a parent species and
then change little for the rest of their existance. (b) In a gradual model, species diverge from one
another mor slowly and steadily over time. (i) 2020 Pearson Education Species steadily diverge
from one another. Periods of stasis are interrupted by change. There is absence of intermediate
fossils. New species change suddenly.

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