The characteristic that defines the Paleozoic era is: Animals with shells and hard parts were dominant for the first time.
Which characteristic defines the Paleozoic era?(1 point)
Responses
Mammals and other warm-blooded animals became dominant.
Mammals and other warm-blooded animals became dominant.
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.
Animals with shells and hard parts were dominant for the first time.
1 answer