It's C, enzymes accelerate chemical reactions.
The mass does not change, the only thing that changes is the weight (that is the force attributed to gravity mg)
Birds and reptiles conduct internal fertilization and lay the eggs outside of the body
Is there a list of statements you have to choose from?
If so, please tell us them. If not, you can summarize it by saying something like:
Water starts at a spring, heads to the sea then vaporizes and is pushed back to land where is condenses and rains, flows to the sea, and the cycle starts again.