a region at which sister chromatids are bound together; a constricted area in condensed chromosomes b cell, nucleus, or organism containing two sets of chromosomes (2n) c chromosomes of the same morphology with genes in the same location d cell, nucleus, or organism containing one set of chromosomes

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Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the