HS-LS4-2

Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment.

  1. Fossils

    ‘Frankenstein’ dino showed a mashup of traits

    New species unearthed in Chile is “an anatomical Frankenstein,” declares one of its discoverers.

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  2. Animals

    Orangutans take the low road

    Cameras spotted orangutans walking down logging roads to get around. That may be a good sign that they can adapt to changes in their woodsy environment.

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  3. Fossils

    Tar pit clues provide ice age news

    New analyses of insects and mammals trapped in the La Brea Tar Pits point to climate surprises during the last ice age.

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  4. Earth

    How people have been shaping the Earth

    We are the dominant force of change on Earth. Some experts propose naming our current time period the ‘Anthropocene’ to reflect our impact.

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  5. Fossils

    Dinos ‘quickly’ shrunk into birds

    Scientists had long known birds descended from dinosaurs. A study now shows that the morphing from dinos into birds went along with a quick and steady shrinking of their body sizes.

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  6. Genetics

    High-altitude help from extinct ancestors

    The Tibetan plateau is high in altitude but low in oxygen. An unusual version of one gene in Tibetans' DNA helps them survive this environment. And that gene appears to have been passed along from Denisovans, a Neandertal-like ancestor.

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  7. Life

    Caught in the act

    Scientists observe some evolutionary speed demons as they adapt over the course of just a few years to new environmental conditions.

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  8. Animals

    Infectious animals

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  9. Animals

    Churk: Not for Thanksgiving

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