Explain the purpose of lignin in the composition of a tree this is not biology but there is no option for the class

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.

How do adaptation affect a species?

How does a gymnosperm prevent itself from pollinating the same tree