13 which of the following chemical compounds
used in coolants and aerosol products have
depleted the ozone layer?
a h, o and co,
b cfcs
c o, and co,
d sulfuric acid and nitric acid

How does natural selection change thephenotypes within a population over time?

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?