Answer:
Testosterone.
Explanation:
Testosterone is the primary sex hormone and anabolic steroid in males. In male humans, testosterone plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
I think the answer is b.
It comes from experience
Disease causing agents are viruses, bacteria, parasites, fungi, etc...
Categories of medicine used to treat these pathogens are:
Antibiotics
Antivirals
Antifungals
Antiparasitics
This warning was most likely issued to prevent people from bringing SARS to the USA when they come back from visiting the countries. So the answer is pretty much to stop the spread
D? just cause they're jumping over, but not sure