Species can diverge from one another either gradually over time or suddenly in a punctuated model. In a punctuated model, new species change rapidly as they branch from a parent species and then change little for the rest of their existence, while in a gradual model species diverge from one another more slowly and steadily over time. The document discusses models of gradual versus punctuated evolution and their implications for the fossil record.

1. (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.