What evidence supports the law of conservation of energy?

a) Mechanical energy is converted to chemical energy during photosynthesis.

b) Oxygen is made from the breakdown of carbon dioxide during photosynthesis.

c) Energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis.

d) The sun gives off light energy that is absorbed by plants.

The answer is (a) Mechanical energy is converted to chemical energy during photosynthesis. This evidence supports the law of conservation of energy as it demonstrates the conversion of one form of energy (mechanical) into another form of energy (chemical) without any energy being created or destroyed. This conversion process follows the principle that energy cannot be created or destroyed, only transformed from one form to another.