What role does the environment play in determining the favorable traits of a species

Survival of the fittest; nature "selects" the organisms best suited to their environment to survive and pass on traits. ... What role does the environment play in natural selection? Species adapt to fit their environment because a species environment is what selects for traits that are fit or less fit.

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humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.