physiology

A simple, scientifically accurate explanation on how people get their skin color for young children in English and Spanish.

Describes the physical characteristics and behavior of horses, pointing out ways in which they differ from people.

Describes the physical characteristics and behavior of pigs, pointing out ways in which they differ from people.

An introduction to the digestive system, discussing each stage of digestion, the organs which aid in the digestive process, and the assimilation of nutrients into the body's structure.

Describes the parts of the eye and how they work.

Looks at the ways in which different animals use their ears, eyes, mouths, noses, feet, and tails.