The process of fermentation happens A whenever a plant receives direct sunlight. B when there is too much glucose for aerobic respiration. с whenever the muscles need more acid. D when there isn't enough oxygen for aerobic respiration.

Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation. However, if oxygen is not present, some organisms can undergo fermentation to continually produce ATP.

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one centimetre is equal to 0.01 metres

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.