Question

match the era on the left with its characteristic on the right.
cenozoic ? when earths atmosphere formed
precambrian ? ended with a massive impact
paleozoic ? when oxygen - breathing organisms first thrived
mesozoic ? began about 65 million years ago

Explanation:

Answer:

Cenozoic \> Began about 65 million years ago
Precambrian \> When Earth's atmosphere formed
Paleozoic \> When oxygen-breathing organisms first thrived
Mesozoic \> Ended with a massive impact