- Question 6 (1 point)
The Earth's atmosphere is composed bf a combination of gases that originate from
different sources and vary with respect to their chemical properties. Which of these
atmospheric components change considerably over time and space?
Carbon Dioxide
Oxygen
Argon
Nitrogen
Question 7 (1 point)

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

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils