HS-LS2-2

Use mathematical representations to support and revise explanations based on evidence about factors affecting biodiversity and populations in ecosystems of different scales.

More Stories in HS-LS2-2

  1. Microbes

    Kitchen sponges are bacteria’s dream home

    Sponges are favorite spots for bacteria, partly because of the mixed-housing environment that the cleaner-uppers offer microbes.

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  2. Animals

    Analyze This: Birds may decorate nests to scare off rivals

    Birds that nest in holes face stiff competition for nest sites. Some use feathers, also found where predators have made a kill, to keep rivals away.

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  3. Life

    Explainer: What is an endangered species?

    Threats such as climate change and habitat loss can put species at risk of going extinct. Different words describe that risk.

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  4. Environment

    Bees and butterflies struggle to find flowers in polluted air

    Emissions from cars and trucks make it harder for insects to find flowers. That in turn reduces flower visits and pollination, a new study finds.

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  5. Environment

    Widely used pesticides may threaten Earth’s ozone layer

    Data show a major class of long-used “eco-friendly” copper chemicals unexpectedly react with soil, making gases harmful to Earth’s protective ozone layer.

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  6. Life

    Living mysteries: Why teeny-weeny tardigrades are tough as nails

    Tardigrades often live in cool, damp moss. Their cushy life has somehow prepared them to survive the lethal radiation of outer space.

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  7. Environment

    Recycling a climate-warming gas could make ‘greener’ farmed fish

    Instead of warming the climate, methane gas can be collected to help farmers. Along the way, it may also save some fish.

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  8. Microbes

    Scientists Say: Bacteria

    Bacteria get a bad rap for making people sick, but only a tiny portion of these single-celled creatures cause disease.

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  9. Life

    In blazing heat, some plants open leaf pores — and risk death

    When heat waves and droughts collide, water is precious. Some thirsty plants try to cool off by opening tiny pores — only to lose water even faster.

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