The problem here is that polar bears don't need to be white. A brown polar bear could still live. Wild radish plants use yellow pigmentation in order to increase their ability to attract pollinators. This sentence illustrates a common but very misleading way of describing natural selection. Second, it reverses cause and effect.
Yellow pigmentation is the result of generations of natural selection.
Yellow flowers receive more visits by bee pollinators, disperse more pollen, and leave more offspring. It is good for the species if males emerge before the female butterflies. The point we wish to make here is perhaps more subtle and involves understanding the difference between natural selection at the level of individuals and natural selection at the level of groups. Although this kind of selection is conceivable, the problem arises when an author, through careless language, implies group selection when he or she means the usual natural selection of individuals, that is, differences among individuals in survival or reproduction. Early emergence by males is favored by natural selection.