Explanation:
All the human causes of global environmental change happen through a ... Three case studies illustrate the various ways human actions can contribute to ... It is possible to make such a division in numerous ways.
Crossing over is essential for the normal segregation of chromosomes during meiosis. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical.
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Species have similar characteristics, but they are rarely, if not never, identical; the difference between them is variation!
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