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7nadin3 [17]
3 years ago
12

4

Biology
2 answers:
Gwar [14]3 years ago
6 0

Answer is Mammals first appeared Dinosaurs had become extinct.This statement is true.

patriot [66]3 years ago
5 0

Answer:

Mammals first appeared

Explanation:

The dinosaurs became extinct one million years after the Cenozoic era started. The mammals first appeared as the modern culture first appeared in that era.

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