The microscopic organisms at the base of the marine food chain are known as
a. primitive life.
b. plant life.
c. terrestrial animals.
d. phytoplankton.

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.