HS-LS2-3

Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.

More Stories in HS-LS2-3

  1. Ecosystems

    Rewilding returns lost species to strengthen ecosystems

    Restoring the missing species can help undo human-caused problems by aiding forests, slowing climate change and reducing wildfires.

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  2. Ecosystems

    Secret forest fungi partner with plants — and help the climate

    Forest fungi are far more than mere mushrooms. They explore. They move nutrients and messages between plants. They can even help fight climate change.

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  3. Animals

    Baleen whales eat — and poop — a lot more than we thought

    The amount of food that some whales eat and then poop out suggests these animals have a powerful influence over ocean ecosystems.

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  4. Plants

    Well-known wildflower turns out to be a secret meat-eater

    Look closely at Triantha occidentalis, and you’ll see gluey hairs — and a trail of insect corpses on its stem.

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  5. Health & Medicine

    What is the role of in-person classes in COVID-19’s spread?

    New data haven’t shown that schools pose a big coronavirus risk to kids and their families, despite fears that they might.

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  6. Earth

    ‘Tree farts’ make up about a fifth of greenhouse gases from ghost forests

    Heat-trapping gases from dead trees play an important role in the environmental impact of “ghost” forests.

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  7. Animals

    Most species of beetles pee differently than other insects

    Scientists uncover their unique system for balancing ions and water. The findings may hint at why beetles are the most diverse animals on Earth.

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  8. Climate

    Changing climate now threatens northern lakes year round

    Lakes in northern climes are getting warmer, and that’s not good for people, plants or animals.

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  9. Agriculture

    Healthy soils are life-giving black gold

    Scientists explain why everyone needs to value the soils beneath our feet — and why we should not view them as dirt.

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