6. a good environmental decision
has no ecological costs
should have more benefits than costs
has only environmental benefits
discounts the environmental costs

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