2. The living together of two organisms that are much alike.

3. The living together of two organisms of different species that complement each other.

4. The living together of two unlike organisms that may benefit from, be harmed by, or not be affected by the association.

5. Symbiosis can occur between two organisms only.

6. True

7. False

8. Symbiosis can be classified according to:

9. The location of the symbiont on the host

10. The dependence of the relationship

11. Both

12. The symbiont is always visible.

13. True

14. False

15. What is lichen?

16. fungi + alga

17. alga + cyanobacterium

18. fungi + alga and/or cyanobacterium

19. Human beings only have microorganisms in their digestive system which help them degrade food and produce vitamins they aren’t able to synthesize.

20. True

21. False

22. The fungus cultivated by antes is affected by pathogenic ______________.

23. bacteria

24. fungi

25. insects

26. Some squids are luminescent because _______________________________.

27. they have bacteria in a light organ which produce light when they are In high density

28. they fish they eat allow them to produce light after digestion

29. their body produces lightAnswers:<br />1. c <br />2. b<br />3. c<br />4. b<br />5. c<br />6. b<br />7. b<br />8. a<br />