Cells divide for many reasons. For example, when you skin your knee, cells divide to replace old, dead, or damaged cells. Cells also divide so living things can grow. When organisms grow, it isn't because cells are getting larger.
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Different forms of a given gene are known as alleles
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The probability of two tossed coins will come down as heads is 1/4. Because you have to calculate the probability of 1/2, multiplied with the probability of the other one - 1/2
Well to reabsorbed most of the water from the urine so that only small amount can be excreted. Desert animals need their water