<span>sexual selection, which alters allele frequencies in the gene pool.</span>
Cells are found in everything on the earth.
See it as matter, matter is everywhere. Everywhere or anything you look at is matter.
There are many types of mutations. Due to some properties of the DNA, some mutations can be harmless, some can change the function of a cell. A cancerous cell is a cell that don't stop to be made because of a malfuntion of the DNA or a chimical factor.<span>
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