A____is a scientific instrument.

Skin is the human body's _____organ.

Skin loses about 30,000 to 40,000 dead skin ____every minute.

Eyes are protected py eyelids and ______.

Brain senses ___to the eyes.

The study of _____ is called zoology.

Every ____thing has a life cycle.

When an animal dies ____from its body go into the soil.

Adult frogs live on land _____.

Plants use nutrients from the ___to help them grow.