Across
- 3. removing a section of the skull to access the brain
- 4. lower part of the back
- 6. reticulum rough and smooth, found in eukaryotic cell
- 9. breaks down molecules into simpler forms
Down
- 1. chemical changes that take place in a cell
- 2. 21 extra copy of chromosome 21
- 3. the skull
- 5. near the pelvis
- 7. closer to the origin
- 8. builds up simple molecules