What happens when-- ?

Explains how flowers and other plants grow from seeds, using water, sunlight, and air to develop.

Describes how our bodies use their resources to fight off infections such as colds and sore throats. Includes activities illustrating how germs spread and how the body reacts to colds.

Describes how our ears take in sound and turn it into messages for the brain. Includes activities illustrating how our auditory system works.

Describes how we use air to build our bodies and to keep ourselves alive and active.

Describes how our bodies grow, how the muscles and bones become larger and stronger, and how our bodies change as we grow older.

Describes how our bodies process the food we eat and turn it into energy. Includes activities to increase our understanding of the digestive system.

Describes how the bones, muscles, lungs, and other parts of the body work together when a person runs.

Describes what happens to our bodies when we sleep and explains why we need this rest.

Describes what happens when the body sustains an injury and how it heals itself.

Describes what happens when our eyes look at objects and send visual messages to the brain.