Which of these atomic models represent the least reactive atom?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

Does all the energy stored by the phytoplankton reach the top level of the pyramid