Cellular respiration uses one molecules of glucose to produce approximately molecules of atp.

a. 36
b. 2
c. 4
d. 24
e. 12

2 ATPs

Explanation:

In the overall reaction, glycolysis converts one six-carbon molecule of glucose into two three-carbon molecules of pyruvate.

The net products of this process are two molecules of ATP ( 4 ATP produced − 2 ATP used up).

The correct answer is- Biogas

Explanation:

Anaerobic digestion of animal waste generates biogas which is a mixture of gases like methane, carbon dioxide, nitrogen, hydrogen, hydrogen sulfide, etc. The primary gas present in biogas is methane which constitutes about 50-75% of total biogas.

Anaerobic or fermentative group of bacteria like methanogens, acetogens, etc acts on animal waste and generates these gases over digestion. This is a natural process that is used by humans to produce methane which acts as fuel that gives energy on burning.

This energy can be used to- generate electricity, cooking, heating, steam production, drying, etc.