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