Match the words with the definitions.

Write the number of the definition near the word.

To breathe [ ]

Oxygen [ ]

A root [ ]

A substance [ ]

1. A chemical element that is a gas with no smell or colour.

2. The part of a plant that grows down into the earth to get water and food and holds the plant firm in the ground.

3. A material with particular physical characteristics.

4. To move air into and out of the lungs.