There is no gravity in space.
gravity= things falling to the ground
no gravity= things that float above ground, like are planets.<span />
I think it would be C. Purchase agreement. Since he is downloading the books, it couldn't be D. because he is buying, not renting, them. A. Loan agreement would be lending the book to Jon, which I don't see fitting this scenario. B. Finance agreement would be a financial agreement, which may be purchase history, or it could be earning money. I would go with C. Purchase agreement.
Here are some of the things that I would like to look at:
-- the micro-organisms in pond water
-- human sperm
-- blood with fresh red cells in it
-- the torn edge of a piece of paper
-- a mosquito's head
-- sugar
-- salt
-- snow flakes
