I'll give brainliest? hurry what type of circulatory system do humans have? a. one loop b. double loop c. triple loop d. quadruple loop

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?

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