For example, hundreds of varieties of dogs have been bred for various tasks from hunting, tracking, to guarding and for esthetic reasons. Similarly our domestic crops have undergone extensive breeding to make them more useful and productive. Corn has been bred to such an extent that is no longer capable of surviving in the wild. Selection whether artificial or natural makes changes in the genetic code by differential survival and reproduction. The changes are are inherited by the offspring.
Selection is the mechanism of making changes in an organisms heredity.
Four Major Steps in Insect Evolution Steps Insect Group Examples 1. Development of insect thorax and body plan from primitive Arthropod body Apterygota - wingless insects Silverfish 2. Paleoptera - old winged insects Dragonflies and mayflies 3. True bugs, roaches, grasshoppers 4.