25.1 What Is an Animal?

Understand Key Concepts

1. A multicellular, eukaryotic heterotroph whose cells lack cell walls is a(n)

   1. protist.

   2. virus.

   3. animal.

   4. plant.

2. Which of the following is characteristic of all chordates but not found in invertebrates?

   1. a notochord

   2. four legs

   3. a circulatory system

   4. an exoskeleton

3. The process by which animals take in oxygen and give off carbon dioxide is known as

   1. responding.

   2. reproducing.

   3. breathing.

   4. excreting.

4. Animals that have a backbone, also called a vertebral column, are known as

   1. invertebrates.

   2. prokaryotes.

   3. homeostasis.

   4. vertebrates.

5. The job of collecting waste materials from a complex animal's body cells and delivering them to organs that will release them from the body is carried out by the

   1. excretory system.

   2. nervous system.

   3. circulatory system.

   4. digestive system.

6. Most animals reproduce

   1. sexually by producing diploid gametes.

   2. asexually by cloning.

   3. sexually by producing haploid gametes.

   4. asexually by fission.

7. List the characteristics shared by all members of the animal kingdom.

8. Describe how feedback inhibition works.

9. Explain why the word invertebrate may be a usefol word but is not a true category in the system of classification.

10. Which body systems are most involved when a raccoon discovers that a full trash can is a food source, and it knocks over the can to find the food?

Think Critically

11. Classify What characteristic distinguishes vertebrates from nonvertebrate chordates?

12. Apply Concepts In what ways do the digestive and respiratory systems depend on the circulatory system to carry out the functions of obtaining nutrients and eliminating wastes?

13. Compare and Contrast How does the way animals dispose of carbon dioxide differ from the way they dispose of ammonia?

14. Relate Cause and Effect Describe generally how the nervous and musculoskeletal systems of a rabbit react when it sees a predator such as a coyote.

25.2 Animal Body Plans and Evolution

Understand Key Concepts

15. Many animals have body symmetry with distinct front and back ends. This type of symmetry is

    1. radial.

    2. bilateral.

    3. circular.

    4. dorsal.

16. The developing embryo shown below is a ?, a group that includes ?.

    

    1. protostome; invertebrates other than echinoderms

    2. protostome; vertebrates

    3. deuterostome; echinoderms and chordates

    4. deuterostome; invertebrates

17. An animal whose mouth is formed from the blastopore is a(n)

    1. deuterostome.

    2. endoderm.

    3. protostome.

    4. mesoderm.

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