Organisms called archaea produce methane gas from atoms of carbon and hydrogen . which of these terms describe methane ? a. Macromolecule

b. compound

c. element

d. atom

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow