Why is the adaptation of organisms (species) to environmental conditions considered the result of evolution?

Rather, it is correct to say that evolution is the result of adaptation and natural selection. A typical example of natural selection is the length of the neck in giraffes: giraffes with short necks were less adapted to the way of life than those with long necks.
Adaptation to environmental conditions and natural selection brought characteristics to various species that helped the most powerful representatives survive and preserve adaptations in the genotype that are useful for offspring.