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Unformatted text preview: -Well-developed nervous system -Includes groups with: No skeleton - invertebrate (see fig 23-2) Primitive cartilage skeleton - jawless fish (see fig 23-3) Cartilage skeleton - cartilaginous fish (see fig 23-4) Bony skeleton - bony fish (see fig 23-5), amphibians (see fig 23-6), reptiles (see fig 23-7), birds (see fig 23-9), mammals (see fig 23-11) marsupials and monotremes (see fig 23-12)...
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- Spring '08
- Biology, DR. STEVEN POMARICO, Primitive cartilage skeleton