Some fish and amphibians have which detect electrical fields that them navigate through dark, murky waters.

a. photoreceptors
b. olfactory receptors
c. electroreceptors
d. thermoreceptors

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