An Overview of Animal Diversity

1
Chapter 32
An Overview of Animal Diversity
Questions prepared by William WischusenLouisiana
State University Michael DiniTexas Tech
University
2
You discover a new organism, a multicellular
eukaryote that is heterotrophic. Discuss how to
best classify this organism.
3
Land animals could be considered to have been
common before the time of the

1. Cambrian explosion.
2. Cenozoic era.
3. Ediacaran biota.
4. Neoproterozoic era.

4
What should animals with radial symmetry be
better able to do than those with bilateral
symmetry?

1. move quickly in one direction
2. detect threats from above or below equally well
3. deal effectively with food distributed
   homogeneously in 360
4. focused attention in a single direction

5
Bilateral symmetry is LEAST associated with

• cephalization.
• the presence of mesoderm.
• an active lifestyle.
• a nervous system with sensory structures
  concentrated at one end of the animal.
• the sessile condition.

6
What is true of modern animal phylogenies?

• They take no account of an animals body plan.
• They portray an animals place on the scale of
  nature (scala naturae).
• They rely solely on molecular (genetic) data.
• They are hypothetical.
• They are immune from error due to homoplasy.