Answer:
Many parts of the cardiovascular system (including the heart) are influenced by gravity. On Earth, for example, the veins in our legs work against gravity to get blood back to the heart. Without gravity, however, the heart and blood vessels change – and the longer the flight, the more severe the changes.
Hydrogen and oxygen cells combine explosively combine.-answers.com
I found this online. on answers.com so I do not own credit.
I think that it is A. it forms new mountains under the water
