6. When virus particles enter a person's body, the body responds by following a specific
pattern. Which of the following steps happens earliest in the fight against an invading
virus?
A. O Viral particles are engulfed by macrophages.
B. O B cells divide to make cells that can make antibodies.
C. O Helper T cells recognize the viral antigens on macrophages.
D. o Killer T cells recognize viral antigens and destroy the infected cells.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.