The two cells that result from a single cell need to have the same amount of genetic material as the initial cell, therefore the DNA needs to be duplicated before the cell divides.
The sister chromatids are attached together so that during anaphase the daugther cells will receive the same chromosomes
I belive the simplest substance is a pure substance made from atoms.
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The Darwin theory with relation to similarity among the unrelated organism looks at either similar function or the similar form and based on this he postulated that some organism possesses common ancestors based on these similarities.
Example: All vertebrates that have spine form one or a group of common ancestors.
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Ok I will help you what is the problem
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