Which characteristic defines the Paleozoic era?(1 point)

Question

Responses

Animals with shells and hard parts were dominant for the first time.
Animals with shells and hard parts were dominant for the first time.

Simple, one-celled life forms were dominant.
Simple, one-celled life forms were dominant.

Reptiles became dominant after a mass extinction.
Reptiles became dominant after a mass extinction.

Mammals and other warm-blooded animals became dominant.

Answer 1

Animals with shells and hard parts were dominant for the first time.