The characteristic that defines the Paleozoic era is that animals with shells and hard parts were dominant for the first time. This era, which lasted from approximately 541 to 252 million years ago, saw significant developments in marine life, including the evolution of organisms with hard shells and exoskeletons, particularly during the Cambrian period.
Which characteristic defines the Paleozoic era?(1 point)
Responses
Reptiles became dominant after a mass extinction.
Reptiles became dominant after a mass extinction.
Mammals and other warm-blooded animals became dominant.
Mammals and other warm-blooded animals became 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.
Simple, one-celled life forms were dominant.
1 answer