How did transgressing and regressing seas affect the quantity and diversity of life forms in the
Paleozoic? What will be an ideal response?
ANS:Transgressing
seas opened up environments that allowed marine organisms to evolve into new species
and increase their numbers. During the following regression, environments would be lost, and there
would be a mass extinction of many invertebrate species. The mass extinction was then followed by
transgressing seas and a rediversification of species and an increase in numbers. The life forms did not
always come back in the same way; for example, large organic reefs that were common in the early
Paleozoic were replaced by small patch reefs in the Late Paleozoic.
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