Adaptation for stronger shells.
natural selection, genetic drift, and mutation
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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Natural selection works on mutations that are already in place. The environmental changes will select for certain mutations if the selective pressure is supplied long enough for several generations of offspring to carry a higher percentage of the mutation.
natural selection, genetic drift, and mutation
Air-breathing animals do not return to breathing water.
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
Through ongoing natural selection a population adapts to its enviroment
Natural selection is the process which determines the shark's evolution. It is humankind that is threatening the sharks' survival.
Populations evolve, but individuals are selected. Natural selection affects individual organisms.
mutations that arise in one group are not passed to the other group through reproduction
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species
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.
Humans directly affect artificial selection. They do this by selecting the specific traits that they prefer which they cannot don in a natural selection.