Which describes the role of energy in photosynthesis and cellular respiration?

a) energy is needed to start photosynthesis and is a product of cellular respiration. b)without light energy, photosynthesis and cellular respiration cannot occur. c)energy is both a reactant and product in photosynthesis and in cellular respiration.

A). Energy is needed to start photosynthesis and is a product of cellular respiration.

Explanation:

Energy in the form of sunlight is absorbed by the plants so as to prepare their food (carbohydrates)in the process of photosynthesis.

The energy is produced in the process of cellular respiration. The cellular respiration involves the break down of glucose molecules in the food in the form of energy currencies called as ATP (Adenosine triphosphate) molecules. This form of energy is required for regulating cellular metabolism and vital functions.

3 hours because it is a decent distance.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.