Hydra Releasing Sperm (18.6)
Jelly Swimming (18.6)
Thimble Jellies (18.6)
Hydra Eating Daphnia (time-lapse) (18.6)
C. Elegans Crawling (18.8)
C. Elegans Embryo Development (time-lapse) (18.8)
Rotifer (18.8)
Nudibranchs (18.9)
Earthworm Locomotion (18.10)
Lobster Mouth Parts (18.11)
How Are Insect Species Identified? (18.12)
Butterfly Emerging (18.12)
18A: Characteristics of Invertebrates (18.13)
Echinoderm Tube Feet (18.13)
Key Concepts Quiz
Manta Ray (18.17)
How Does Bone Structure Shed Light on the Origin of Birds? (18.20)
Bat Licking Nectar (18.20)
Flapping Geese (18.20)
Soaring Hawk (18.20)
Swans Taking Flight (18.20)
18B: Characteristics of Chordates (18.21)
Whale Eating a Seal (18.21)
Chimp Cracking Nut (18.21)
Key Concepts Quiz
18C: Animal Phylogenic Tree (18.22)
How Do Molecular Data Fit Traditional Phylogenies? (18.22)
Key Concepts Quiz