Why are liners laid down at the bottom of a landfill before waste is deposited in the landfill?
a.) to prevent bacteria from the soil entering and decomposing the trash
b.) to provide a system for capturing usable water from trash
c.) to prevent hazardous substances in the trash from leaking into the groundwater
d.) to provide a way to collect methane gas building up in the trash
if you could would be great. you ; ) : )

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

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

What molecule contains an organisms genetic material, passed down from parents to their offspring