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- https://bio.libretexts.org/Courses/Citrus_College/Citrus_College_General_Biology_Textbook/13%3A_Evolution_and_Natural_Selection/13.02%3A_Discovering_How_Populations_ChangeEvolution by natural selection arises from three conditions: individuals within a species vary, some of those variations are heritable, and organisms have more offspring than resources can support. Th...Evolution by natural selection arises from three conditions: individuals within a species vary, some of those variations are heritable, and organisms have more offspring than resources can support. The consequence is that individuals with relatively advantageous variations will be more likely to survive and have higher reproductive rates than those individuals with different traits. The advantageous traits will be passed on to offspring in greater proportion.
- https://bio.libretexts.org/Workbench/General_Biology_I_and_II/04%3A_Unit_IV-_Evolutionary_Processes/4.1%3A_Evolution-_Introduction_Mechanisms_and_Speciation/4.1.1%3A_Understanding_EvolutionEvolution, the unifying theory of biology, describes the change and diversification of species over time. All species of living organisms, including bacteria and chimpanzees, evolved at some point fro...Evolution, the unifying theory of biology, describes the change and diversification of species over time. All species of living organisms, including bacteria and chimpanzees, evolved at some point from a different species. Although it may seem that living things today stay the same, this is not the case: evolution is a gradual and ongoing process.
- https://bio.libretexts.org/Courses/Thompson_Rivers_University/Principles_of_Biology_II_OL_ed/02%3A_Evolution/2.02%3A_Evolution-_History_Evidence_and_Mechanisms/2.2.01%3A_Understanding_EvolutionEvolution, the unifying theory of biology, describes the change and diversification of species over time. All species of living organisms, including bacteria and chimpanzees, evolved at some point fro...Evolution, the unifying theory of biology, describes the change and diversification of species over time. All species of living organisms, including bacteria and chimpanzees, evolved at some point from a different species. Although it may seem that living things today stay the same, this is not the case: evolution is a gradual and ongoing process.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/16%3A_The_Anatomy_and_Physiology_of_Plants/16.02%3A_Plant_Physiology/16.2F%3A_TropismsThis page explains tropisms in plants, which are growth movements influenced by external stimuli. There are positive (toward the stimulus) and negative (away from the stimulus) tropisms, with key type...This page explains tropisms in plants, which are growth movements influenced by external stimuli. There are positive (toward the stimulus) and negative (away from the stimulus) tropisms, with key types being phototropism (light) and gravitropism (gravity). Stems grow towards light (positively phototropic) and away from gravity (negatively gravitropic), while roots do the opposite.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/18%3A_Evolution/18.01%3A_Evolution_and_AdaptationThis page summarizes key concepts of evolution introduced by Charles Darwin in "The Origin of Species," focusing on adaptation, natural selection, and speciation. It highlights various selection types...This page summarizes key concepts of evolution introduced by Charles Darwin in "The Origin of Species," focusing on adaptation, natural selection, and speciation. It highlights various selection types, including stabilizing, directional, and disruptive selection, as well as examples like finch beak size related to gene expression and the peppered moth's adaptation to pollution.
- https://bio.libretexts.org/Courses/Evergreen_Valley_College/Introduction_to_Ecology_(Kappus)/04%3A_Natural_Selection_and_Evolution/4.01%3A_Darwin_Wallace_and_the_Theory_of_Natural_SelectionWhen Charles Darwin embarked on his around the world voyage on the HMS Beagle, he was 22 years old. As the ship's naturalist, he was responsible for exploring and collecting biological and geological ...When Charles Darwin embarked on his around the world voyage on the HMS Beagle, he was 22 years old. As the ship's naturalist, he was responsible for exploring and collecting biological and geological specimens wherever they went ashore. This allowed him to compare global patterns in living and fossil organisms, leading eventually to the development of the theory of evolution through natural selection. Although he published first, others, including Alfred Wallace, were developing similar ideas.
