Which component is released form the active site of and enzyme during a chemical reaction

I believe the correct answer would be substrate.

When enzymes react to the chemical reaction, the reactants would then be called substrates.

Hope I could help! :)

c. movement because i took the test and it lets me review my answers

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.