Invertebrate Diversity
WebQuest
WebQuest icon TidePoolQuest
Concept 1
Diverse animals share several key characteristics.
Concept 1 icon Online Activity 23.1    Characterize animals.
Concept 2
Sponges are relatively simple animals with porous bodies.
Concept 2 icon Online Activity 23.2    Explore sponges.
Concept 3
Cnidarians are radial animals with stinging cells.
Concept 3 icon Online Activity 23.3    Explore cnidarians.
Concept 4
Flatworms are the simplest bilateral animals.
Concept 4 icon Online Activity 23.4    Explore flatworms.
Concept 5
Roundworms and rotifers have complete digestive tracts.
Concept 5 icon Online Activity 23.5    Explore roundworms.
Concept 6
Annelids are segmented worms.
Concept 6 icon Online Activity 23.6    Explore annelids.
Concept 7
Mollusks show diverse variations on a common body form.
Concept 7 icon Online Activity 23.7    Explore mollusks.
Lab icon Lab 23 Online Companion    Mapping a Mollusk
Concept 8
Echinoderms have spiny skin and a water vascular system.
Concept 8 icon Online Activity 23.8    Explore echinoderms.
Concept 9
Animal diversity "exploded" during the Cambrian period.
Concept 9 icon Online Activity 23.9    Activate a phylogenetic tree.
Science, Technology, & Society icon Science, Technology, & Society    Protecting Coral Reefs
Chapter 23 Assessment Chapter Assessment icon Chapter 23 Assessment
Chapter text icon Chapter Text