If you do not know the answer than do not answer, I do not want my points wasted. I will give brainliest if you help.

2. Without flowers some plants cannot reproduce.

Explanation:

1)the energy required to start the reaction enzyme lower the activation energy. 2)reactions in cells would be too slow to sustain life. the reaction of carbonic acid formation in cells takes about a hundred years without enzymes. with enzymes, it takes 3 seconds.