I haven't read the Physics, but I would guess that Aristotle believes that the final cause of teeth is to aid in nutrition. I'm not really sure what the final cause of rain is, but it might certainly include the growing of corn.
The third cause that was omitted by RedbeardUH is the efficient cause, the proximal source of motion or change.
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The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty
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