Across
- 2. an animal that naturally preys on others
- 6. the basic unit of life
- 8. a plant alkaloid irritating to the skin
- 10. very good
- 13. invisible to the naked eye
- 15. a person employed to clean the streets
- 17. relating to animal migration
- 20. move rapidly donwards through the air
- 21. relating to science
- 23. a person striking violent against another
- 24. be full of or swarming with
Down
- 1. a vein carries blood to the heart
- 3. politely refuse
- 4. able to adjust to new conditions
- 5. bone of the spine its in the backbone segment
- 7. very small
- 9. relating to birds
- 11. hunts frogs for food
- 12. the center of cell
- 14. one making cell transmissions
- 16. send from one person to another person
- 17. thin flexible film eardrum
- 18. flying high in the air
- 19. freely offer to do something
- 22. a group of people live in same places