Across
- 2. Source of nitrogen for plants
- 4. Fishes breathe through ______.
- 5. earthworms breath through their _____
- 8. The rigid rod is arranged in such a manner that it can move freely around a fixed joint
- 9. It is the turning point or the point of support around which the rod moves
- 10. Protects our heart and lungs
- 12. Source of nitrogen for animals
- 14. An aquatic animal that breathes through lungs
- 15. When we put simple machines together, we get.
- 18. 33 of them forms the backbone
- 19. Chambers in animal's body part where exchange of gases takes place in breathing
Down
- 1. Example of a complex machine
- 3. States of matter where molecules are tightly packed.
- 5. In solid _______ attract each other wit great force.
- 6. A part of the body that is protected by backbone
- 7. The three states of matter depend on the ________ of particles.
- 11. The process by which seeds are scattered away from mother plant.
- 13. The gas that is essential for life
- 16. It contains stored food which is used by baby plant for growth
- 17. Gas that prevents fires from becoming uncontrollable