Similarities between exothermic and endothermic

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

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

How does the carbon cycle involve an exchange of carbon