What is The nerve cell or neuron that carry impulses from brain to muscle and gland

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources? (site 1)

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen