Across
- 2. it travels in a straight line
- 5. we breath it out
- 7. it is how plants grow
- 9. it cauese heat in ou body and it also has something to do with our breathing
- 10. we drink it
Down
- 1. it is a green stain that comes from grass
- 3. the control center off the cells
- 4. plants inhale this
- 6. you may be in your tea/coffee
- 8. scientists make sure they only change one variable in all experiments