Question
Geologic Time Quick Check
2 of 52 of 5 Items
Question
Which characteristic defines the Paleozoic era?(1 point)
Responses
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.
Mammals and other warm-blooded animals became dominant.
Animals with shells and hard parts were dominant for the first time.
Answers
GPT-4o mini
The characteristic that defines the Paleozoic era is:
**Animals with shells and hard parts were dominant for the first time.**
This era is known for the emergence of many diverse forms of life, particularly during the Cambrian Explosion, which saw the development of hard-shelled organisms.
**Animals with shells and hard parts were dominant for the first time.**
This era is known for the emergence of many diverse forms of life, particularly during the Cambrian Explosion, which saw the development of hard-shelled organisms.