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Author Question: During which time period were dinosaurs most abundant?[br][br][b][color=black]Question ... (Read 41 times)

sjones

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on: Jul 18, 2018
During which time period were dinosaurs most abundant?

Question 2

Why werent plants the first form of life to appear on earth?


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bubulittle310@msn.cn

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

Dinosaurs were most abundant during the Jurassic period, 180135 million years ago.

Answer to Question 2

Some 2.2 billion years ago, free oxygen was present in the atmosphere. Living things used this reactive substance,
not decaying plant material, in biochemical functions of their cells. The free oxygen in the atmosphere also
produced a layer of ozone, which filters out the ultraviolet light from the sun that is harmful to life.


sjones

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Reply #2 on: Jul 18, 2018
TY


bubulittle310@msn.cn

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Reply #3 on: Jul 18, 2018
Happy to Help


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