7th Grade Science Student ebook

15.2 INVERTEBRATE STRUCTURE AND FUNCTION

CHAPTER 15: ANIMALS

15.2 Section Review

1. Why do scientists classify sponges as animals?


2. Complete the table below. The first row is done for you.


3. Use the list of phyla in the table above to answer the following
   questions:
   a. Which phylum does not have tissues, organs, or nerves?
   b. Which phyla have a well-developed nervous system?
   c. Which phyla do not have a brain or head?
   d. Which phyla do not have an internal or external skeleton or
   shell?
   e. Which phylum has an exoskeleton?
   f. Which phyla have segmented bodies?
   g. Which phyla have a complete gut?
   h. Which phylum has a foot, mantle, and shell?
   i. Which phyla live only in water?

Phylum Symmetry Body cavity Example

Porifera asymmetrical none sponges

Cnidaria

Flatworm

Roundworm

Annelid

Mollusk

Arthropod

Echinoderm

The diagram on the previous page

shows evolutionary relationships

among invertebrates and

vertebrates. The trilobite shown

below is a fossil organism.

Propose where to place the

trilobite on the diagram.