1. Ch. 18 sec. 3 Answers

2. 1. Why are autotrophs called producers?

4. 2. What do bacteria using chemosynthesis get their energy from?

6. 3. What is biomass?

8. 4. How is a heterotroph different from an autotroph?

10. 5. What is another name for consumers?

12. 6. What do herbivores eat?

14. 7. What do carnivores eat?

16. 8. What do omnivores eat?

18. 9. What do detritivores eat?

19. 9. What do detrivores eat?

20. 10. What do decomposers cause?

22. 11. What does a trophic level indicate?

24. 12. How is a food chain different from a food web?

27. 13. On average, what percent of the total energy from one trophic level is incorporated into the next?

29. 14. Why do ecosystems rarely contain more than a few trophic levels?