Question

Which characteristic defines the Paleozoic era?(1 point) 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. Reptiles became dominant after a mass extinction. Reptiles became dominant after a mass extinction. Simple, one-celled life forms were dominant. Simple, one-celled life forms were dominant. Mammals and other warm-blooded animals became dominant.

Answer 1

[AI-generated answer — Bot GPT 3.5]

The characteristic that defines the Paleozoic era is: Animals with shells and hard parts were dominant for the first time.