Take a sledge hammer and throw it up in the air over your head and don't move I dare you. And then tell me gravity isn't a law.
Why did astronauts have those special suits on if gravity don't exist.
Things fall. That is an observation. On earth they fall at a rate of approx 32 fps^2 Newton's law is F=G(m1m2/r^2) That is a "law" because as far as Newton could tell, it was always true. But note that it's just a mathematical observation of WHAT happens, not WHY. The cause could be invisible elves pushing everything down and the law would still be true. Except of course that Einstein showed it's not always true.
The THEORY of gravity is WHY and HOW things are attracted to each other. That is not well understood. The why and how of observed changes in species is much better understood.
"Things fall" is NOT proof of the THEORY of gravity. It doesn't prove the ideas of WHY things fall.