Earth’s helps protect life from ultraviolet radiation. Earth’s atmosphere is mostly made up of the gases and .

There is some evidence to suggest that Mars once had liquid , though now it may be trapped as .

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?