What are chlorofluorocarbons made of?
Chlorofluorocarbons are organic compounds consisting of carbon, fluorine, and ?

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased