What role do lichens play in primary succession

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Using meiosis, the sporophyte produces spores that are .

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.