Variation naturally occurs in populations as new traits arise from random mutations. However, through natural selection only those traits that are beneficial to the organism are passed on to the next generation. Any harmful mutations are naturally weeded out.
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Genetic variation in itself does not 'support' natural selection: it is what natural selection acts upon.
Genetic variation. If there were no variation in the genes/phenotype then natural selection would have nothing to select from.
Natural selection is only the result of changing environments, mutation and the variation resulting therein. Natural selection is the process of adaptive change and the main mechanism of evolution that leads to speciation. Natural selection is a process as mutation and variation are grist to the mill of natural selection.
What population? Perhaps you mean if there were no variation for natural selection to select from.
The four stages are: Overproduction, Genetic Variation, Struggle to Survive, and Successful Reproduction