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

  1. Microbes

    Microbes mine treasure from waste

    Like miniature factories, bioreactors house microbes recruited to chew through wastes to clean dirty water, make chemicals or generate electricity.

  2. Animals

    News Brief: Bees prefer caffeine-spiked nectar

    Bees usually alert friends to sources of especially sweet nectar. But a new study finds caffeine is every bit as appealing to them as the sugar is. And that could compromise the quality of their honey.

  3. Agriculture

    Organic food starts to prove its worth

    Organic food often comes with a higher price. But research is showing that food grown this way can be better for the environment — and possibly for us.

  4. Plants

    Using plants to solve environmental problems

    Problems in their communities suggested good research projects to three teens. Each wanted to tackle a different issue, from pollution to world hunger. To learn more about these issues, they turned to their local ponds, wetlands and gardens.

  5. Microbes

    Life’s ultra-slow lane is deep beneath the sea

    Biologists had suspected the deep seafloor would be little more than barren sediment. But they found a surprising amount of oxygen — and life.

  6. Microbes

    Recycling the dead

    When things die, nature breaks them down through a process we know as rot. Without it, none of us would be here. Now, scientists are trying to better understand it so that they can use rot — preserving its role in feeding all living things.

  7. Animals

    Surprise! Fossils in a flash

    By studying how dead tissues decay — or turn to ‘instant’ fossils — scientists are gleaning helpful clues to what ancient life looked like.

  8. Microbes

    Life in the bacterial underground

  9. Animals

    A fallout feast for crabs

  10. Climate

    A change in climate

  11. Earth

    Deep drilling at sea