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