| A | B |
|---|
| Invertebrates | Animals that lack a backbone |
| Platyhelminthes | flatworms make up this phylum |
| acoelomates | flatworms have no coelom (fluid filled cavity) |
| flame cells | flatworms: remove excess water & ammonia (metabolic wastes) |
| hermaphrodite | individual with both male & female reproductive organs |
| scolex | head of an adult tapeworm |
| proglottids | segments that make up most tapeworm's body |
| Nematoda | round worms make up this phylum |
| pseudocoelom | roundworms: body cavity partially with mesoderm tissue |
| Annelida | phylum that make up segmented worms |
| closed circulatory system | system in which blood is ontained within a network of blood vessels |
| gill | gas exchange of gses underwater |
| Anterior end | The end of an animal that contains its head |
| Posterior end | The end of an animal that contains the tail |
| Circulatory system | A system designed to transport food and other necessary substances throughout a creature's body |
| clitellum | earthworm: band of thickened segments that secrete a mucous ring in which eggs & sperm are released |
| leeches | segmented worms: suck blood |
| Hermaphroditic | Possessing both the male and female reproductive organs |
| Regeneration | The ability to re-grow a missing part of the body |
| Mantle | A sheath of tissue that encloses the vital organs of a mollusk, secretes its shell, and performs respiration |
| Shell | A tough, multilayered structure secreted by the mantle. It is usually used for protection, but sometimes for body support |
| Visceral hump | A hump that contains a mollusk's heart, digestive, and excretory organs |
| Foot | A muscular organ that is used for locomotion and takes a variety of forms depending on the animal |
| Radula | A organ covered with teeth that mollusks use to scrape food into their mouths |
| Univalve | An organism with a single shell |
| Bivalve | An organism with two shells |
| Molluska | phylum in which clams, snails, squids, nautiluses |
| open circulatory system | molluska; blood pumped thru vessels and thru different sinuses |
| nephridia | structure that releases ammonia from blood to outside body |
| Gastropoda | single shelled mollusks; snails; |
| Bivalvia | two shelled mollusks; clams oysters, mussels |
| Cephalopoda | small internal/no shell; octopu, squids |
