HS-LS4-5

Evaluate the evidence supporting claims that changes in environmental conditions may result in: (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species.

More Stories in HS-LS4-5

  1. Fossils

    An ancient hippo-sized reptile may have been a speedy beast

    An Anteosaurus was a hefty reptile with a large snout. Its fossil skull hints that it may have moved fast for its time.

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  2. Health & Medicine

    Bringing COVID-19 vaccines to much of world is hard

    The price of not vaccinating nearly everyone across the world could be a longer pandemic and more troubling variants of the new coronavirus.

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  3. Animals

    A new chameleon species may be the world’s tiniest reptile

    The newly described reptiles live in the northern forests of Madagascar. Deforestation there may also leave them on the brink of extinction.

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  4. Animals

    How do you build a centaur?

    A centaur has the torso of a human and the body of a horse. It may sound cool, but it wouldn’t work very well.

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  5. Archaeology

    Harsh Ice Age winters may have helped turn wolves into dogs

    In the Ice Age, Arctic hunters may have turned to some game for their fatty bones. Much of those animals’ meat might have been left to domesticate dogs.

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  6. Health & Medicine

    Early details emerge about the new U.K. coronavirus variant

    The variant may spread more easily from person to person. That could make continuing to wear masks all the more important, experts say.

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  7. Genetics

    Scientists Say: Evolution

    Evolution is how species change over time. Individuals in the group vary, and some will pass on their genes. Over time, the whole species changes.

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  8. Chemistry

    Stinky success: Scientists identify the chemistry of B.O.

    They turned up the enzyme in bacteria behind that underarm stench. Understanding how it works could pave the way to new types of deodorant.

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  9. Health & Medicine

    A Hong Kong man got the new coronavirus twice

    His is the first confirmed case of reinfection with this virus. His second bout was detected by accident, because he showed no symptoms.

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