Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to

Answer: Use the host cells biosynthetic machinery for its own growth and energy production.

Explanation:

Viruses are considered non-living because they lack cells to produce their own food and cannot grow or live on their own. Once they invade their host, they use its biosynthetic machinery for survival.