natural selection is when the species are adapted to a area so they change for example color of skin is changed to help hide or to hunt its prey
For example of natural selection think about an elephant being hunted for their tusks and adaptation would be that there tusk be any material but ivory. an example would be to have many elapants and witch ever is the best would reproduce.
natural selection can not be altered so its up to to us not to kill them for there ivory tucks and let natural selection do its thing
each on of all offspring from 2 parents will get some of the same genies but will not be identical with the parents.