A science challenge for young explorers.

A caterpillar forms a chrysalis and later emerges as a butterfly.

Receptors inside the nose detect scents in the air.

A young cat is called a kitten.

Most fish use gills to take oxygen from water.

Plants generally need water and light along with air and nutrients.

Polar bears are suited to the cold Arctic environment.

Rain falls when water droplets in clouds become heavy enough.

Roots hold the plant in place and take in water and nutrients.

The ears receive sound vibrations.

The Sun produces light; the other objects only reflect light.