Across
- 1. is the smallest unit of life.
- 2. is the human immunodeficiency virus.
- 3. The largest planet in the solar system.
- 5. is the process of exchange of gases in the body.
- 7. are the four directions in the word.
- 8. energy produced by the sun.
Down
- 1. Is the study of the stars.
- 2. they feed on plants.
- 4. it is the process of transforming food.
- 6. support the plant.