Which of the following organic molecules is a major storage carbohydrates used to store energy in plants

Glycogen (the polysaccharide used by animals to store energy), and cellulose (plant fiber).

Glycogen is a multi branched polysaccharide of glucose that serves as a form of energy storage in humans, animals, fungi, and bacteria. The polysaccharide structure represents the main storage form of glucose in the body.

i'd say that the moon rock is about 2.2 billion years old.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."