Question

18)┬аHow did the appearance of microbial life on land increase the formation of a living soil during early Earth, which in turn allowed for the evolution of land plants? A) Microbes allowed plants to uptake oxygen-containing compounds through the process of oxygen fixation. B) Microbes allowed plants to uptake carbon-containing compounds through the process of carbon fixation. C) Microbes allowed plants to uptake hydrogen-containing compounds through the process of hydrogen fixation. D) Microbes allowed plants to uptake nitrogen-containing compounds through the process of nitrogen fixation.

Answer 1

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Answer 2

Answer:

The correct answer is D. Microbes allowed plants to uptake nitrogen-containing compounds through the process of nitrogen fixation.

Explanation:

Nitrogen-fixing bacteria allowed for the transformation of atmospheric nitrogen into fixed-nitrogen compounds usable by plants.