23) Only the fittest survive. (In actuality, if an organism can barely get by then it classified into the "fit" category).
The term fit is hard to define when considering whole organism. To be more precise, we must look at the genes. The neutral and advantageous genes make up the popluation while negative genes are filtered out over time through natural selection. Any given organism can contain a variety of the three categories of genes.
It is not the most fit species that survive, but the species most adaptive to change - Charles Darwin
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