The gravitation pull of the moon and the sun cause ocean currents and tides
Do you have choices to choose from? If mechanical weathering is in the choices (if you have them) then it would be mechanical weathering
Basically his experiments, which scientists came to know only after he was dead. His experiments, and of course, the result of this experiments that served as a proof of what Mendel afirmed, where one of the most importnat factors that made his ideas accepted.
They where also accepted because he discovered DNA, the basic laws of inheritance and chromossomes.
Hope it helped,
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