Day and night on Earth are marked by "sunrise" and "sunset," even though the Sun does not move. Which statement best explains what causes day and night on Earth?

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