HS-LS2-8

Evaluate the evidence for the role of group behavior on individual and species' chances to survive and reproduce.

  1. Animals

    Bee underfeeds eldest daughter, creating ‘nursemaid’

    By giving a brood’s firstborn female smaller portions and a low-protein diet, a mother bee can turn the offspring into a nursemaid for her younger siblings.

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  2. Microbes

    Mouth germs team up to boost disease risk

    The oxygen given off by harmless mouth bacteria can help disease-causing invaders grow strong and flourish.

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  3. Agriculture

    Sneaky! Virus sickens plants, but helps them multiply

    The cucumber mosaic virus helps tomato plants lure pollinators. When the plants multiply, the virus now gets new hosts.

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  4. Microbes

    Staph infections? The nose knows how to fight them

    Bacteria living in some people’s noses make a compound that could help fight a nasty type of infection that laughs at other antibiotics.

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  5. Genetics

    GM mosquitoes cut rate of viral disease in Brazil

    Adults males carrying the altered gene cannot father young that survive to adulthood. That’s when they suck blood — and can transmit disease.

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  6. Plants

    Climate closing the gender gap for this mountain flower

    Among valerian plants, males like it hotter than the females do. So a warming climate has been speeding their migration up once-cool mountainsides.

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  7. Animals

    Frigate birds spend months without landing

    Frigate birds can fly non-stop for months. They stay in the air with the help of upward-moving airflows, a new study finds.

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  8. Environment

    Scientists Say: Poisonous

    A poison-arrow frog is poisonous, but a rattlesnake is not. What’s the difference? It’s how the poison is delivered.

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  9. Animals

    This mammal has the world’s slowest metabolism

    A sloth species manages to exist with a super-slow metabolism by moving little and using its environment for heating and cooling its body.

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  10. Chemistry

    Scientists Say: Toxin

    It is safe to refer to any poison as toxic. But while all toxins are poisonous, most poisons are not toxins.

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  11. Animals

    Singing lemurs sync up — until one goes solo

    The indri lemurs of Madagascar sing in chorus to mark their territory. But young males sometimes solo, which may help them attract a mate.

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  12. Animals

    Leapin’ eels! Video shows they attack with zaps

    When a predator threatens an electric eel from above, the animals leap up to deliver a shocking defense.

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