D .Terrestrial biomes are distinguished primarily by their product
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Air from the outside environment first enters the respiratory system through the nostrils. and then after the nostrils it will actually go through your mouth, and then it will go to your pharynx, and then go through the trace and then the larynx, after that it will pass by the bronchial tubes and then the right lung and last is the left lung.
I would say ultraviolet radiation b/c the atmosphere of early earth was much "thinner" then it is today letting much more U/V radiation come though
The answer is shallow, warm, continental seas.
