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One was Darwin's theory was the process of evolution by natural selection and the second one was Lyell's theory was that animals can adapt and change their traits to fit the environment.
mechanisms that maximum lifetime reproductive success.
Charles Darwin expanded a common theory of evolution by noting the course of natural selection. He was able to study the categorization of plants and animals species and the beginning of genetics.
natural selection and common descent
evolution. the fossil record. uniformitarianism. the origin of new species. natural selection.
That evolutionary theory is accurate, at least in its fundamental theses: common descent and natural selection.
There is currently only one theory of evolution: the theory of evolution by natural selection, as pioneered by Charles Darwin, which describes how the diverse modern life forms derived from their common ancestors.
Natural selection is the gradual, non-random process by which individuals with a different trait or traits are more reproductively successful than others. This relies on variation existing in the population. Natural selection results in traits becoming more or less common in the population based on the success of those with the trait(s). Natural selection is the main mechanism for evolution. Favourable traits make it more likely for these animals to survive and pass on their genes. This means that over time, more of the population will have these genetics. This can result in species which specialize - and may become a new species. This is how natural selection relates to evolution.
Evolution is garnered by natural selection. Natural selection occurs when a mutation in a gene leads to a greater fitness in an individual(able to have more offspring). These individuals are better suited for their environment and thus survive more often and reproduce more making the gene more common. That evolution in a nutshell.
Natural selection over long periods of time leads to a fitter and more reproductively successful group of organisms thus becoming more common in a population. It will lead to evolution.
Evolution is both theory and fact. Moreover, the fundamental theses of the theory (common descent, natural selection) are so well supported by fact that they might as well be called fact.
There is no separate theory of evolution for humans. Human evolution is the theory of evolution applied to humans. Evolutionary theory states that modern lifeforms, including humans, derive from common ancestors through a process of reproductive variation and natural selection.