How is the sea of electrons model is used to explain the physical properties of metals? electrons give off a charge, the greater or lesser the metal will depend on how packed the universe is in the metal, atoms and such.
Mutations can also be caused by exposure to specific chemicals or radiation. These agents cause the DNA to break down. This is not necessarily unnatural  even in the most isolated and pristine environments, DNA breaks down. Nevertheless, when the cell repairs the DNA, it might not do a perfect job of the repair.
Besides being the result of a mistake during cell division, mutations can also occur when the DNA in a cell is damaged by an irritant. Examples of irritants that can damage DNA are radiation, inflammation, or free radicals (unstable molecules that arise from metabolism and can damage cells).esides being the result of a mistake during cell division, mutations can also occur when the DNA in a cell is damaged by an irritant. Examples of irritants that can damage DNA are radiation, inflammation, or free radicals (unstable molecules that arise from metabolism and can damage cells).