Every year one hundred trees remove approximately from the atmosphere. a. five tons of carbon dioxide b. four hundred pounds of ozone c. three hundred pounds of particulates d. all of the above

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