What happens to the enzyme after an enzymatic reaction is complete? a) it loses a carbon atom b) it gains a water molecule c) it loses its hydrogen atom d) nothing happenes

The Option D is correct.

During an enzyme catalyzed reaction the enzyme bonds with a specific substrate at the active site. This is called an enzyme-substrate complex. The substrate is converted into a specific product, but the enzyme remains unchanged. Enzymes accelerate reactions by factors of at least a million.

the supermassive black hole is in the middle of the galaxy.

the animal that would be cutest if scaled down to the size of a cat? elephant