HS-LS1-7

Use a model to illustrate that cellular respiration is a chemical process whereby the bonds of food molecules and oxygen molecules are broken and the bonds in new compounds are formed resulting in a net transfer of energy.

  1. 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.

    By Kathiann Kowalski
  2. Animals

    Eating can be skin deep

    In the laboratory, bottom-dwelling hagfish absorb nutrients through the skin.

    By Stephen Ornes
  3. Chemistry

    Explainer: What are oxidants and antioxidants?

    Certain chemicals, including many in foods, fight chemical reactions that could harm cells in the body and in wildlife.

    By Janet Raloff
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