Organisms are affected by Natural Selection because Inherited characteristics affected the likelihood of an organism's survival and reproduction.
natural selection is basiclly only the strong survive which means it effects the weak by killing them but bernifits the strong
Populations evolve, but individuals are selected. Natural selection affects individual organisms.
Natural selection is the process which determines the shark's evolution. It is humankind that is threatening the sharks' survival.
Evolution by natural selection is currently the only viable theory explaining the diversity of life. However, the mechanism of natural selection is not the only mechanism to affect evolution. There are phenomena such as genetic drift, biased gene conversion, intragenomic conflict, and so on, that aren't exactly the same as natural selection (although they are all intertwined and all affect one another), but do affect the direction of evolution.
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Adaptation for stronger shells.
How does natural selection affect undesirable traits?
Natural selection acts on the way organisms interact with one another and with their environment. The genes of organisms are not usually themselves involved in this interaction: they direct it through intermediaries such as proteins. So natural selection must work through these intermediaries to affect genes.
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Because of the environment they live in.
No, a frog is not an example of natural selection itself. Natural selection is a mechanism for evolution that acts on populations of organisms over generations, influencing the traits that are passed on to the next generation. Individual organisms like a frog can be impacted by natural selection, depending on their traits and how those traits affect their survival and reproduction.
When nothing happens to exert strong population pressure on that population, natural selection favors the allele frequency already present. When mutations cause new traits, natural selection weeds these traits out because they're not as efficient as the others.