Evolution is well supported by many examples of changes in various species leading to the diversity of life seen today. "If someone could really demonstrate a better explanation than evolution and natural selection, [that person] would be the new Darwin," Richmond said.
Despite Wegener's use of evidence and logic to develop his explanations, other scientists found it difficult to imagine how solid, brittle continents could plow through the equally solid and brittle rock material of the ocean floor. Wegener did not have an explanation for how the continents moved. Since there was no plausible mechanism for continental drift, the idea did not take hold. The hypothesis of continental drift was equivalent to the hypothesis of evolution in the decades before Darwin, when evolution lacked the idea of variation followed by natural selection as an explanatory mechanism.
Evolution by Natural Selection | Serendip Studio
CORRECTION: This fallacious argument is based on the idea that evolution and religion are fundamentally the same since they are both "belief systems." This idea is simply incorrect. Belief in religious ideas is based on faith, and religion deals with topics beyond the realm of the natural world. Acceptance of scientific ideas (like evolution) is based on evidence from the natural world, and science is limited to studying the phenomena and processes of the natural world. Supreme Court and other Federal court decisions clearly differentiate science from religion and do not permit the advocacy of religious doctrine in science (or other public school) classes. Other decisions specifically uphold a school district's right to require the teaching of evolution. For additional information on , visit the NCSE website. To , visit the Understanding Science website.
Natural Selection: How Evolution Works - ActionBioscience
Advanced students of evolutionary biology may be interested to know that selection can act at different levels and that, in some circumstances, species-level or group-level selection may occur. However, it's important to remember that, even in this case, selection has no foresight and is not "aiming" at any outcome; it is simply favoring the reproducing units that are best at leaving copies of themselves in the next generation. To , visit our side trip on this topic.
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So what's the evolutionary explanation for altruism if it's not for the good of the species? There are many ways that such behaviors can evolve. For example, if altruistic acts are "repaid" at other times, this sort of behavior may be favored by natural selection. Similarly, if altruistic behavior increases the survival and reproduction of an individual's kin (who are also likely to carry altruistic genes), this behavior can spread through a population via natural selection. To , visit our article on this topic.
It is broken into three main outcomes
CORRECTION: Many of us are familiar with the biological species concept, which defines a species as a group of individuals that actually or potentially interbreed in nature. That definition of a species might seem cut and dried and for many organisms (e.g., mammals), it works well but in many other cases, this definition is difficult to apply. For example, many bacteria reproduce mainly asexually. How can the biological species concept be applied to them? Many plants and some animals form hybrids in nature, even if they largely mate within their own groups. Should groups that occasionally hybridize in selected areas be considered the same species or separate species? The concept of a species is a fuzzy one because humans invented the concept to help get a grasp on the diversity of the natural world. It is difficult to apply because the term species reflects our attempts to give discrete names to different parts of the tree of life which is not discrete at all, but a continuous web of life, connected from its roots to its leaves. To , visit Evolution 101. To , visit this side trip.