Who We Are
4.1 The Evolutionary Origins of Animalia
4.2 Characteristics of Animals
4.3 The First Invertebrates: Sponges, Jellyfish, and Relatives
4.4 The Protostomes
4.5 The Deuterostomes—I: Echinoderms, Chordates, and Relatives
4.6 The Deuterostomes—II: Vertebrates
Clues to the Evolution of Multicellularity
Biology in the News: Canadian Scientists Wipe Away Misconceptions about Sponges
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