Genetic mutation is what leads to the mechanism of natural
selection, and thus contributes directly to evolution, a necessary
and useful process. The crossing over and randomization at
fertilization also increases variation. Without the variation that
results from mutations, natural selection would not occur, thus
proving that genetic mutations are beneficial and crucial for life.
However, cancer is a disease caused by mutation. Does this mean
that cancer is inescapable for all humans if we simply live long
enough?