Summary

Concept 23.1: Distinct Body Plans Evolved among the Animals

Concept 23.2: Some Animal Groups Fall outside the Bilateria

Concept 23.3: Protostomes Have an Anterior Brain and a Ventral Nervous System

Concept 23.4: Arthropods Are Diverse and Abundant Animals

Concept 23.5: Deuterostomes Include Echinoderms, Hemichordates, and Chordates

Concept 23.6: Life on Land Contributed to Vertebrate Diversification

Concept 23.7: Humans Evolved among the Primates

See ACTIVITY 23.4 for a concept review of the major groups of organisms.

Go to the Interactive Summary to review key figures, Animated Tutorials, and Activities

PoL2e.com/is23

Go to LaunchPad at macmillanhighered.com/launchpad for additional resources, including LearningCurve Quizzes, Flashcards, and many other study and review resources.