How does the environment select organisms

Environment selects organisms by only allowing organisms of certain trait or abilities to survive in the environment. For example, a polar bear cannot survive in the desert because it's thick fur is adapted to colder environment. The idea of the survival of the fittest is involved in the process

The process in which the environment selects organisms that will survive is called natural selection. It starts with overproduction; when an organism produces more offpsrings than can survive. The second is variation. Because there are so many offsprings, there will be variations.