Across
- 2. I am a planet where a day is longer than a year.
- 5. An astronomical object with gravity so strong that even light cannot
- 6. Laughing gas.
- 9. Longest bone in the human body.
- 10. Bird that can fly backward.
- 12. I carry oxygen around your body.
Down
- 1. Study of silkworms rearing.
- 3. Largest organ in human body.
- 4. I have 3 hearts and blue blood.
- 7. Coloured part of the eye.
- 8. Which animal has the strongest muscles relative to its body size?
- 11. Chemical element named after a Marvel superhero.