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Author Question: The first birds and mammals appeared 135 million years ago during the ____________________ period. ... (Read 57 times)

APUS57

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on: Jul 18, 2018
The first birds and mammals appeared 135 million years ago during the ___________________ _ period.
 Fill in the blank(s) with correct word

Question 2

The ___________________ _ in the atmosphere filters out the ultraviolet light from the sun that is harmful to life.
 Fill in the blank(s) with correct word


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leeeep

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Reply #1 on: Jul 18, 2018
Answer to Question 1

Jurassic

Answer to Question 2

ozone


APUS57

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Reply 2 on: Jul 18, 2018
Gracias!

xiaomengxian

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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