Jets and airplanes are made of composite materials like fiberglass, but these materials, though lightweight, can be cracked and punctured. Airplane manufacturers still rely on materials like aluminum because it is so

A)dense.
B)ductile.
C)malleable.
D)soluble.

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