Not quite. Gravity is a Law. We know that it exists, and a baseline constant. We also know that wherever in the universe we go, there will be some gravity.
Evolution is a theory. We know it happened. We don't have a great deal more solid than that.
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Gravity is both a theory and a law. Newton wrote about the law of gravity (i.e. N=mg, etc.), Einstein wrote about the theory of gravity (i.e. gravitons, the Lorentz factor, etc.). A law is describing a natural phenomenon, and a theory is explaining that phenomenon.