The Earth has a total land area of approximately 150 million
square km. About how much is covered by rain forest?
A. 1.5 million square km
B. 10.5 million square km
C. 15 million square km
D. 50 million square km

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

Tides that occur during the new and full moons

How many copies of genes do gametes have?