Across
- 4. a term used for several closely related green pigments found in cyanobacteria
- 6. Dioxide its what you breathe out
Down
- 1. how sweet of you (Looney Tunes)
- 2. it electromagnetic radiation within a certain portion of the electromagnetic spectrum.
- 3. chemical element with symbol O and atomic number 8.
- 5. Its chemical formula is H2O