Please Help!!
Which of the following statements is true of living systems!

What is the difference between an igneous, sedimentary and metamorphic rock

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 why biological control methods are generally environmentally superior to chemical pest control methods.