Section 1

objectives

• Identify four important characteristics of animals.

• List two kinds of tissues found only in animals.

• Explain how the first animals may have evolved from unicellular organisms.

• Identify four features found only in chordates.

• Identify two functions of the body cavity.

• List the structural features that taxonomists use to classify animals.

vocabulary animal vertebrate invertebrate specialization ingestion zygote differentiation chordate notochord dorsal nerve cord pharyngeal pouch symmetry radial symmetry dorsal ventral anterior posterior bilateral symmetry cephalization germ layer

www.scilinks.org Topic: Multicellular

Organisms Keyword: HM61002

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