Across
- 3. a poisonous substance produced organically
- 4. a protein that produces an immune response
- 5. eating both meat and vegetables
- 7. densely wooded tropical area with heavy participation
- 11. the distance that light travels in a vaccum in one year
- 12. an immense cloud of gas and dust in outer space
- 13. animal or plant that lives on or in a host
- 14. relation between two interdependen species of organisms
- 16. plant tissue that conducts food from leaves to the parts where they are needed
- 18. when the sun is at a great distance from the equator
- 19. isolation to prevent the spread of disease
- 21. sleeps during the day and active at night
- 22. the condition that allows an organism to resist disease
Down
- 1. colorless gas that is a screen for ultraviolet radiation
- 2. a change or alteration in form from normal qualities
- 3. a vast, treeless, permanently frozen plain
- 6. animals with bony skeletons
- 8. woody part of plants that conduct water
- 9. the scientific study of animals
- 10. having wavelengths shorter than light but longer than x-rays
- 15. the female of this mammal has a carrying pouch for the young
- 17. a plant occuring in crusty patches on tree trunks or rocks
- 20. injection of dead microbes to create antibodies to prevent disease