How do the nervous system and endocrine system work together?

a. nerves are made of gland cells.
b. glands are made of nerve cells.
c. nerves tell glands when to release chemicals.
d. glands tell nerves when to activate.

C. Nerves tell glands when to release chemicals.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called