Mutagenesis is an essential process in evolution, generating an array of genetically unique organisms from which natural selection selects the best-suited to the immediate environment. Compatible and favorable mutations quickly converge; because offspring may inherit distinct advantageous mutations from both parents, and thus dramatically increase their survival rate. Parental crossing results in the accumulation of advantageous mutations in offspring. Evolutionary adaptation has allowed organisms to progressively specialize, and colonize, even in the most extreme of habitats.