Ihave a test pls ! what substances cross the cell membrane during facilitated diffusion? choose 1 a) water b) proteins c) cholesterol d) carbohydrates

What causes darkening of the skin as melanin production increases

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.

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