If you found two fossils in two different layers of sedimentary rock stacked on each other, how would you know which is older?

What happens when the cell copies its chromosomes

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.