_______ is essential for animal and microbe respiration, which helps support plant growth.

Oxygen

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Carbon dioxide

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Nitrogen

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Both B and C

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Solution

The correct option is A Oxygen
Soil respiration refers to the production of carbon dioxide when soil organisms respire. This includes respiration of plant roots, the rhizosphere, microbes and fauna.
These respire in the presence of oxygen to release carbon dioxide. Hence, oxygen is essential for root and microbe respiration.

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