Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
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Meiosis occurs in humans, animals, plants and fungi, and its a sexual type of reproduction. The daughter cells are different, cause the chromosomes are mixed. Mitosis is a asexual type of reproduction and the daughter cells are identical.
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The cardiovascular system I think. Hope this helps