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

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download