Please help with these 2 problems

Anybody who knows ap biology, can you friend or message me

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

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.