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| 6204063264 | Phylum Chordata (Chordates) | 1) notochord 2) dorsal tubular nerve cord 3) pharyngeal pouches 4) Postanal tail | 0 | |
| 6204063265 | notochord | dorsal supporting rod located just below the nerve cord (embryonic) | 1 | |
| 6204063266 | dorsal tubular nerve cord | becomes the brain in most chordates | 2 | |
| 6204063267 | pharyngeal pouches | becomes gills or modified for various purposes | 3 | |
| 6204063268 | cephalochordates | nonvertebrate chordates; lancelets (look like surgical knife) shallow water along most coasts feed on microscopic particles | 4 | |
| 6204063269 | urochordates | nonvertebrate chordates live on ocean floor squirt out water from their excurrent siphon when disturbed bbilaterally symmetrical as larva sessile adults numerous cilia | 5 | |
| 6204063270 | vertebrates | 1) vertebral column 2) skull 3) endoskeleton 4) internal organs | 6 | |
| 6204063272 | tetrapods | have four limbs | 7 | |
| 6204063273 | amniotes | embryo surrounded by an amniotic membrane that encloses the amniotic fluid | 8 | |
| 6204063274 | fishes | largest group of vertebrates | 9 | |
| 6204063276 | Agnathans | jawless fish cartilaginous skeleton and persistent notochord cylindrical smooth, nonscaly skin lamphreys: parasitic or filter feeders | 10 | |
| 6204063277 | Jawed Fishes | 1) Ectothermy 2) gills 3) cartilaginous or bony exoskeleton 4) scales | 11 | |
| 6204063279 | Chondrichthyes | cartilaginous fishes sharks, rays, skates, and chimeras 5-7 gill slits spiracles dermal denticles- tiny teeth-like scales sense electric currents, lateral line system, keen sense of smell biggest sharks are filter feeders | 12 | |
| 6204063285 | Osteichthymes | bony fishes | 13 | |
| 6204063288 | swim bladder | a gas-filled sac into which fish can secrete gases or from which they can absorb gases; altering its pressure; changes buoyancy | 14 | |
| 6204063290 | amphibians | 1) limbs (tetrapods) 2) smooth and nonscaly skin 3) lungs 4) double-loop circulatory pathway 5) sense organs 6) ectothermy 7) aquatic reproduction | 15 | |
| 6204063291 | cloaca | terminal chamber common to the urinary, digestive and genital tract in amphibians | 16 | |
| 6204063293 | Reptiles | 1) paired limbs 2) thick and dry skin (impermeable to water) 3) efficient breathing 4) efficient circulation 5) efficient excretion 6) ectothermy 7) well-adapted reproduction (amniotic egg) | 17 | |
| 6204063294 | Birds | 1) feathers 2) modified skeleton 3) modified respiration 4) endothermy 5) well-developed sense organs & nervous system | 18 | |
| 6204063295 | Mammals | 1) hair 2) mammary glands 3) skeleton 4) internal organs 5) internal development | 19 | |
| 6204063296 | Monotremes | egg-laying mammals that include only the duckbill platypus | 20 | |
| 6204063297 | Marsupials | pouched mammals kangaroos, Tasmanian devils, wombats, sugar gliders | 21 | |
| 6204063298 | Placental mammals | dominant group of mammals; dependent on placenta during development | 22 | |
| 6204063299 | placenta | an organ of exchange between maternal blood and fetal blood | 23 |
