chapter 3 review

Chapter 3 Review Questions

(Student textbook pages 137–9)

1. d

2. b

3. d

4. d

8. c


9. Plant cell walls are made primarily of cellulose. Fungal cell walls are made primarily of chitin. Animal cells do not have cell walls.


10. The main characteristic that distinguishes these two groups is the presence or absence of a backbone. Animals without backbones are invertebrates, whereas those with backbones are vertebrates. All but one (34/35) animal phyla are made entirely of invertebrates.


Chapter 3 Self-Assessment Questions

(Student textbook pages 140–1)

1. a

3. b

6. d

7. d

8. a

9. d


17. They are composite organisms made of a fungus and a photosynthetic organism.


21. echinodermata- endoskeleton, water vascular system


22. arthropoda- jointed appendages, exoskeleton


23. Mammal: makes milk, has hair


25. The more biodiverse an ecosystem is, the more resilient it is to disturbance.