In this activity, students are introduced to the concept of "calorie" and compare the relative amounts of energy in similar-sized portions of a carbohydrate-based food and a food rich in oils.

In this activity, students are introduced to the relationship between food and energy. Students will observe what happens when yeast, a single-celled fungus, is provided with food (table sugar).

Healthy soil gives us many benefits, including nutritious food. During this video, I interview a local farmer to find out how he takes care of his soil. I also demonstrate an activity where students can try their hand at designing their own soil-friendly yard or green space, either at home or at school.

Students will describe at least three energy-obtaining strategies used by organisms in deep-sea reef communities. They will also interpret analyses of oxygen isotope values to connect these energy-obtaining strategies with the organisms found in the communities.

This encyclopedia entry is for the term "autotroph." An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Text for this entry is appropriate for the middle and high school grade levels.