[Campbell Biology Page 44] Campbell Biology 12th Edition
33 An Introduction to Invertebrates 686 CONCEPT 33.1 Sponges are basal animals that lack tissues 690 CONCEPT 33.2 Cnidarians are an ancient phylum of eumetazoan
33 An Introduction to Invertebrates 686 CONCEPT 33.1 Sponges are basal animals that lack tissues 690 CONCEPT 33.2 Cnidarians are an ancient phylum of eumetazoan