L9A
L9B
33.1 Sponges are basal animals that lack true tissues
33.2 Cnidariand are an ancient phylum of eumetazoans
33.3 Lophotrochozoans, a clade identified by molecular data, have the widest range of animal body forms
33.4 Ecdysozoans are the most species-rich animal group
33.5 Echinoderms and chordates are deuterostomes