Chapter 13: Mollusks, Worms, Arthropods, Echinoderms

Use the photo below to answer question 16.
16. Describe how this animal obtains food.
17. Compare the ability of clams, oysters, scallops,
and squid to protect themselves.
18. Compare and contrast an earthworm gizzard
to teeth in other animals.
19. Explain the evidence that mollusks and
annelids may share a common ancestor.
20. Infer how taking in extra water or air after
molting, but before the new exoskeleton
hardens, helps an arthropod.
21. Classify the following animals into arthropod
groups: spider, pill bug, crayfish, grasshopper,
crab, silverfish, cricket, wasp, scorpion,
shrimp, barnacle, tick, and butterfly.
22. Compare and Contrast Copy and complete
this Venn diagram to compare and contrast
arthropods to annelids.
Closed
circulatory
system
Annelids Arthropods
Bilateral
symmetry
Open
circulatory
system
life.msscience.com/chapter_review
23. Recognize Cause and Effect If all the earthworms
were removed from a hectare of
soil, what would happen to the soil? Why?
24. Research Information The suffix -ptera means
“wings.” Research the meaning of the prefix
listed below and give an example of a
member of each insect group.
Diptera Homoptera
Orthoptera Hemiptera
Coleoptera
25. Construct Choose an arthropod that develops
through complete metamorphosis and
construct a three-dimensional model for
each of the four stages.
Use the table below to answer questions 26 and 27.
Described Species
Type of Or er of Described Species
Anthropod 1,065,000
Land plants 270,000
Fungi 72,000
Mollusks 70,000
Nematodes 25,000
Birds 10,000
Mammals 5,000
Bacteria 4,000
Other 145,000
26. Arthropods Using the table above, what percentage
of organisms are arthropods? Mollusks?
27. Species Distribution Make a bar graph that
shows the number of described species listed in
the table above.
CHAPTER REVIEW 389
William Leonard/DRK Photo