Sample Response: When the environment changes, organisms best suited for the new environment survive and reproduce. This allows the favorable adaptation to be passed on to the next generation. Over time, more and more organisms will have the favorable adaptation, and the population will evolve.
QUICK ANSWERNatural selection leads to evolution because the traits of those who are able to reproduce influence future generations genetics and gradually lead to these passed on traits becoming the normal state of being, thus causing the species in question to evolve. If a group of people have predominantly brown hair genes and have children, then by way of natural selection the dominant gene will increase with future generations, meaning that slowly in time this group of people will evolve to have mostly brown hair genes
Natural selection occurs when organisms with the traits most suited to the environment survive and reproduce. Also, there are four conditions required for natural selection. That is overproduction of offspring, variation, natural selection of favorable adaptions,
and favorable adaptations building in a population.
