Animal Origins and Diversity | pol2e_ch23_1.html | 553e8aed757a2e0e21000000 |
Concept 23.1: Distinct Body Plans Evolved among the Animals | pol2e_ch23_2.html | 553e8aed757a2e0e21000000 |
Concept 23.2: Some Animal Groups Fall outside the Bilateria | pol2e_ch23_3.html | 553e8aed757a2e0e21000000 |
Concept 23.3: Protostomes Have an Anterior Brain and a Ventral Nervous System | pol2e_ch23_4.html | 553e8aed757a2e0e21000000 |
Concept 23.4: Arthropods Are Diverse and Abundant Animals | pol2e_ch23_5.html | 553e8aed757a2e0e21000000 |
Concept 23.5: Deuterostomes Include Echinoderms, Hemichordates, and Chordates | pol2e_ch23_6.html | 553e8aed757a2e0e21000000 |
Concept 23.6: Life on Land Contributed to Vertebrate Diversification | pol2e_ch23_7.html | 553e8aed757a2e0e21000000 |
Concept 23.7: Humans Evolved among the Primates | pol2e_ch23_8.html | 553e8aed757a2e0e21000000 |