Responses
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.
Animals with shells and hard parts were dominant for the first time.
Mammals and other warm-blooded animals became dominant.
Mammals and other warm-blooded animals became dominant.
Reptiles became dominant after a mass extinction.
1 answer
The characteristic that defines the Paleozoic era is:
Animals with shells and hard parts were dominant for the first time.
The Paleozoic era is known for the emergence of complex life forms, including those with hard shells, which had a significant impact on marine ecosystems, particularly during periods like the Cambrian explosion.
