McGraw-Hill Companies, Inc. - WALKER'S CLASS
Name
48 Master Phylogeny of
Worms and Mollusks
Date
Class
Basic Concepts
Use with Chapter 27, Section 27.2
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
UNIT 8
CHAPTER 27 Mollusks and Segmented Worms 85
Name
Date
Class
48 Worksheet Phylogeny of
Worms and Mollusks
Basic Concepts
Use with Chapter 27, Section 27.2
1. Of all the organisms shown, which is the most complex?
2. Based only on fossil evidence, during what era did bivalves apparently evolve?
3. To which phylum and class do snails belong? 4. To which phylum do earthworms belong?
5. To which phylum do the turbellarians, trematodes, and cestodes belong? What is the common name of this phylum?
6. Cestoda, Trematoda, and Turbellaria all branch from the same evolutionary line. How does the illustration show this? Explain the significance of having a common evolutionary branch in terms of relatedness between species.
7. Even though bivalves and gastropods are more complex than worms, the fossils of bivalves and gastropods are older than those of worms. How might this be explained?
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
86 CHAPTER 27 Mollusks and Segmented Worms
UNIT 8
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