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| 2397889302 | invertebrates | animals that lack a backbone | 0 | |
| 2397891445 | porifera | asymmetrical sponges, live in freshwater/marine habitats, simple and sessile organs | 1 | |
| 2397894804 | suspension feeders | capture suspended food particles as water passes through their bodies | 2 | |
| 2397895728 | porocytes | doughnut-shaped cells where the water enters through for suspension feeding | 3 | |
| 2397897640 | spongocoel | large interior cavity | 4 | |
| 2397897641 | osculum | large, common opening where water exits | 5 | |
| 2397898844 | choanocytes | collar, flagellated cells; generate current; embedded in cell matrix (beat in unison to create current); trap food particles in collar cell | 6 | |
| 2397904157 | amoebocytes | multi-functional cells; totipotent; wander through matrix; manufactures spicules and spongin. also can form gametes | 7 | |
| 2397905941 | totipotent | can change form/function to complete a job | 8 | |
| 2397909371 | matrix | gelationous region; mesohyl | 9 | |
| 2397911627 | spicules and spongin | support structure made of fibrous protein | 10 | |
| 2397913891 | hermaphrodites | each individual functions as both male and female in sexual reproduction by producing both sperm and eggs | 11 | |
| 2397923063 | cnidaria | hydras, jellyfish, sea anenomes; basal members of clade eumetazoa. diploblastic. | 12 | |
| 2397930676 | gastrovascular cavity | single digestive compartment; single opening of combination mouth and anus | 13 | |
| 2397932907 | two variations of cnidaria | polyp and medusa | 14 | |
| 2397932908 | polyp | cylindrical, sessile forms | 15 | |
| 2397934505 | medusa | flattened, bell-shaped, moves in water | 16 | |
| 2397943522 | gastrodermis | surrounds gastrovascular cavity | 17 | |
| 2397944673 | nerve net | allows coordinated contraction of bundled microfilaments | 18 | |
| 2397945542 | nematocysts | cnidae with specialized stinging thread capable of injecting toxin | 19 | |
| 2397948505 | cnidocytes | cells capable of inverting and exploding outward | 20 | |
| 2397950508 | Medusozoans | both solitary and colonial forms in life; polyp is the dominant generation | 21 | |
| 2397967356 | anthozoa | sea anemones and corals; can be solitary or colonial | 22 | |
| 2397973257 | cnetophora | sea gooseberries and combjellies; diploblastic, radial symmetry; bioluminescent, tentacles lack stinging, but have adhesive cells; move by means of eight rows of ciliary combs | 23 | |
| 2397983093 | platyhelminthes | flatworms; tripoblastic eumetozoan; bilaterally symmetrical; dorsally-ventrally flattened; can be free-living or parasitic; terrestrial, flatwater and marine | 24 | |
| 2397987946 | acoelomate | flate shape increases surface area; places all cells either near environment or their gut. gas exchange can occur by diffusion across the body surface | 25 | |
| 2397989921 | exoskeleton | external skeleton made of calcium carbonate | 26 | |
| 2398027997 | protonephiridia | networks of branched tubules that maintain osmotic balance | 27 | |
| 2403895885 | free-living rhabitophora | planarians | 28 | |
| 2403895886 | planarians | mostly marine; use cilia or muscles to swim. light-sensing organs on head (cluster of ganglia), mouth at tip of muscular pharynx. adapt at regeneration, sexual hermaphrodites | 29 | |
| 2403900063 | parasitic rhabitophora | trematodes and tapeworms | 30 | |
| 2403901427 | trematodes | sexual/asexual lifecycle with numerous hosts, requires invertebrate intermediate host before reproducing in final host, use two suckers to adhere to host, tough epidermis protects parasite from host defenses | 31 | |
| 2403907452 | tapeworms | attacks vertebrates, lacks gastrovascular cavity, has scolex and proglottids | 32 | |
| 2403909805 | scolex | structure on anterior end (armed with hooks and suckers) | 33 | |
| 2403910839 | proglottids | sacs of reproductive organs | 34 | |
| 2403912538 | rotifera | freshwater, marine, and damp soil. have an alimentary canal, parthenogenesis, wheel-bearer, psuedocoelomate, tripoblastic eumatozoan | 35 | |
| 2403916117 | alimentary canal | allows stepwise digestion of food; one way system with two openings for entering nutrients and passing waste | 36 | |
| 2403917679 | wheel-bearer | crown of cilia and anterior end that draws water into mouth | 37 | |
| 2403918547 | parthenogenesis | form of asexual reproduction | 38 | |
| 2403919324 | mollusca | chitins, snails, slugs, clams, octopi, and squid. protected by calcium carbonate shell (some have reduced or absent shell) | 39 | |
| 2403921723 | muscular foot | used for movement | 40 | |
| 2403922280 | visceral mass | bulk of body | 41 | |
| 2403922281 | mantel | outer covering of soft body component | 42 | |
| 2403923433 | nephridium | excretory organs | 43 | |
| 2403924072 | radula | hooks/barbs to pull in food, can scrape algae apart | 44 | |
| 2403924858 | open circulatory system | fluid called "hemolymph" is propelled by a heart through short arteries and then into spaces surrounding the tissues and organs | 45 | |
| 2403925690 | chitins | eight plates on dorsal side, ventral side is primarily large muscular foot, radula is used to scrape algae of rocks | 46 | |
| 2403928643 | gastropoda | snails/slugs. eyes at end of tentacles, use muscular foot to move, radula is used for grazing, use of torsion is in effect | 47 | |
| 2403932607 | torsion | during embryonic development, the visceral mass rotates 180 degrees, twisting the body mass to allow easy digestive track | 48 | |
| 2403934358 | bivalvia | clams, oysters, mussels, scallops. hinged shell with adductor muscles. lack head and radula. gills are used for feeding and respiration | 49 | |
| 2403938762 | cephalopoda | octopi, squid, nautilus. active predators, mantle covers visceral mass, foot modified into siphon and tentacles, closed circulatory system, well-developed senses with complex brain | 50 | |
| 2403943632 | closed circulatory system | blood remains separate from fluid in the body cavity | 51 | |
| 2403944325 | siphon | modified from foot | 52 | |
| 2403944326 | annelida | errantians and sedentarians. worms with a segmented body series with fused rings (coelom is partitioned by septa), each segment has a layer of longitudional muscles surrounded by circular muscle. some have hemoglobin | 53 | |
| 2403951722 | metanephridia | excretory organs located on each segment | 54 | |
| 2403953332 | errantians | marine annelids, parapodia on each segment (with several chatae), unique cephalic senstory organs and jaws. highly vascularized with passive transport | 55 | |
| 2403958985 | chaetae | chitinous bristles, help with locomotion | 56 | |
| 2403961628 | parapodia | paddle-like structures that are the primary function with locomotion | 57 | |
| 2403964081 | sedentarians | plume worms, earthworms, leeches. may or may not have chaetae, parapodia. clitellum may be present. | 58 | |
| 2406979240 | nematocytes | specialized cnidae, contain a stinging thread that can penetrate the body wall of the prey | 59 | |
| 2407332602 | protonephridia | networks of tubules with ciliated structures called flame bulbs that pull fluid through branched ducts opening to the outside | 60 | |
| 2407355895 | intermediate host | characteristic of trematodes, requires an invertebrate as a pit stop before infecting a host where reproduction occurs | 61 | |
| 2407360191 | final host | where a parasite (such as a trematode) reproduces in a vertebrate body | 62 | |
| 2407364752 | lophophore | a crown of ciliated tentacles that function in feeding | 63 | |
| 2407384582 | adductor muscles | in bivalves, the halves are drawn tightly together to protect the animal's soft body | 64 | |
| 2407393101 | longitudinal muscle | coordinates with circular muscle to facilitate movement in annelids | 65 | |
| 2407398412 | circular muscle | coordinates with longitudinal muscle to facilitate movement in annelids | 66 | |
| 2407404423 | seta/chaeta | chitinous bristles, function in movement | 67 | |
| 2408712786 | cuticle | tough external coat; used in ecdysozoans. shed during molting/ecdysis | 68 | |
| 2408717616 | molting | shedding the cuticle in order to facilitate extended growth | 69 | |
| 2434438614 | clitellum | secretes mucus, used for reproduction | 70 | |
| 2434440170 | ecdysozoans | nematoda and arthropoda | 71 | |
| 2434443694 | nematoda | round worms; pseudocoelomate. exclusively longitudinal muscle result in thrashing movement. causes elephantiasis, lack circulatory system. not segmented. | 72 | |
| 2434538472 | arthropoda | coelomate, open circulatory system with segmented bodies (cephalothorax holding sensory organs/legs), chitinous exoskeleton with two unusual Hox genes (involved in controlling segmentation).. | 73 | |
| 2434544291 | arthropoda lineages | chelicerates, myriapods, pancrustaceans (hexapods), and pancrustaceans (crustaceans) | 74 | |
| 2434546133 | chelicerates | horseshoe crab, arachnids, euryterids, sea spiders. claw-like feeding appendages with pedipalps. two body segments, lack antennae. simple eyes. chemiosensors are in leg bristles | 75 | |
| 2434551462 | pedipalps | leg-like structures, used for feeding | 76 | |
| 2439197585 | myriapoda | millipedes/centipedes. jaw-like mandibles, numerous body segments. | 77 | |
| 2451695817 | pancrustae: hexapoda | most diverse, three body segments with flight adaptations. courtship rituals, distinct pollinators | 78 | |
| 2451703522 | pancrustae: crustacea | ostracods, barnacles, daphnea, walking legs on thorax. two pairs of antennae | 79 | |
| 2451740318 | echinodermata | sessile, pentamerous symmetry. has a water vascular system. endoskeleton made of hard calcareous plates. madreporite, tube feet, dioecious. | 80 | |
| 2451757676 | water vascular system | network of hydraulic channels branch into extension exit poits | 81 | |
| 2451760542 | tube feet | extensions leading to exit points. used with locomotion, feeding, and gas exchange | 82 | |
| 2451763301 | dioecious | bilateral larva develop into adult through a metamorphic process (madreporite is off center) | 83 | |
| 2451802051 | asteroidea | sea stars and sea daisies, five (+) arms radiating from central disk. tube feet in undersurface that act like suction disks. capable of regeneration | 84 | |
| 2451805948 | echinodea | sea urchins and sand dollars, five rows of tube feet (functions in slow movement). have muscles so they can use their long spine which aids in movement. complex jaws (adapted for seaweed) | 85 | |
| 2451811762 | holothuroidea | sea cucumbers, lack spines (endoskeleton much reduced). five rows of small tube feet (pentamorous symmetry), some modified into tentacles which surround the mouth | 86 |
