<span>ectopic pregnancies are never viable and must be surgically removed-true</span>
Extreme climates changes are independent. But some other types are dependent. However, they are too minor to really be included.
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Crossing over produces modern combinations of alleles. Not unused alleles but unused combinations which can result in modern phenotypes or expanded assortment of phenotypes. This way the there's expanded genotype/phenotype variety but the genuine qualities are still the same ones.
