What were the pelycosaurs, and why were they important? What will be an ideal ...

Pelycosaurs were finback reptiles, which became the dominant reptiles in the Permian. They were the
first land-dwelling vertebrates to become diverse and widespread.

On land, animals had to worry about reproduction, desiccation, gravity, and the extraction of oxygen
from the atmosphere.

The development of predators had a major impact because organisms that had previously not needed
defense mechanisms either developed defense systems or suffered great population losses.

Lobe-finned fish, particularly the crosspterygians, may have been part of the transition from fish to
amphibians.

Almost all major invertebrate phyla evolved during the Cambrian, although many were represented by
only a few species.