Answer:
The enzyme's active site must be the mold shape of the substrate.
Explanation:
An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.
The answer choice is going to be B.
Boiling Water is a physical change. When water gets to a certain temperature, it's boiling point starts.
The answer I believe is 3.340kj.