Enzymes are organic catalysts
and catalysts generally increase rate of reaction by lowering activation energy
C is the answer
4 infiltration percolation!! I think! Correct me if I’m wrong
When you boil water, you aren't changing the elements. You're just making water vapor. However, when you burn paper, it becomes carbon (mostly). So physical changes will not change the substance, only chemical changes will.
Because some atoms<span> are more stable when they </span>gain or lose<span> an </span>electron<span> and </span>form ions<span>.</span>
