How does melanin protect cells?

Average annual precipitation and are the two major features that define the biomes on earth.

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?