Which substance is a reactant in photosynthesis?
o
o
a. glucose
b. nitrogen
o
c. carbon dioxide
o
d. oxygen

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Which soil would most likely be found in the arctic? andisols gelisols histosols spodosols