Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.
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Astronomers have always assumed that Uranus must have been knocked onto its side by a collision. Now a new idea suggests that the planet's remarkable tilt could have another explanation.
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The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
In the 1900s most immigrants came from western europe