Students learn about the digestive process and describes each major organ in the system. Text for this article is appropriate for the upper elementary levels. A Spanish version of the article and a read-aloud option are also provided on the site.

Students learn about the heart and circulatory system and how to monitor and care for the heart. Text for this article is appropriate for the upper elementary levels. A Spanish version of the article and a read-aloud option are also provided on the site.

Students learn about the lungs and the basic information about inhalation and exhalation. Text for this article is appropriate for the upper elementary grade levels. A Spanish version of the article and a read-aloud option are also provided on the site.

Students learn about muscles and the basic information about the three types of muscles found in the human body. Text for this article is appropriate for the upper elementary grade levels. A Spanish version of the article and a read-aloud option are also provided on the site.

This encyclopedia entry is for the term "food chain." A food chain describes who eats whom in the wild. Text for this entry is appropriate for the upper elementary, middle and high school grade levels.

This is an encyclopedia entry for the term "herbivore." An herbivore is an organism that mostly feeds on plants. Text for this entry is appropriate for the upper elementary, middle, and high school grade levels.

This is an encyclopedia entry for the term "omnivore." An omnivore is an organism that regularly consumes a variety of material, including plants, animals, algae, and fungi. Text for this entry is appropriate for upper elementary, middle, and high school grade levels.