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Moderate

Absence of Oxygen

APBIO-4VEXTH

In the absence of oxygen, plants will break down sugars into carbon dioxide and alcohols or acids.

This pathway likely arose

A

to get the most out phosphorylation per molecule of pyruvate without the ability to utilize respiration.

B

as an alternative process to compete with respiration.

C

to regenerate depleted NAD$^+$.

D

because of human cultivation.