I need help with my use test stuff for biology

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.

Explain how organisms could be harmed by high levels of salt from roadways?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?