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Evolution does not work this way.
This is why need, try, and want are not very accurate words when it comes to explaining evolution. The population or individual does not want or try to evolve, and natural selection cannot try to supply what an organism needs. Natural selection just selects among whatever variations exist in the population. The result is evolution.
At the opposite end scale, natural selection is sometimes interpreted as a random process. This is also a misconception. The genetic variation that occurs in a population because of mutation is random-but selection acts on that variation in a very non-random way: genetic variants that aid survival and reproduction are much more likely to become common than variants that don't. Natural selection is NOT random!
|||Survival of the fit enough|
|Lesson plans for teaching about natural selection|
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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.