| Term | Definition |
|---|
| Arthropod | bilaterally symmetrical anumal with hointed appendages, a protective exoskelton, and a segmented body |
| Appendage | structure such as a claw, leg, or antenna that grows from the body |
| Radula | scratchy, toungelike organ in many mollusks that has rows of teethlike projections used to scrape and grate food |
| Exoskelton | rigid, protective body covering of an arthropod that supports the body and reduces water loss |
| Metamorphosis | change of body form that can be complete (egg, larva, pupa, adult) or incomplete (egg, nymph, adult |
| Polyp | vase-shaped, usually sessile body form in the life cycle of a cnidarian |
| Closed circulatory system | a type of blood-circulation system in which blood is transported through blood vessels rather than surrounding the organs |
| Open circulatory system | a type of blood-circulation system that lacks blood vessels and in which blood washes over the organs |
| Cnidarian | radically symmetrical, hollow-bodied animal with two cell layers organized into tissues |
| Invertebrate | an animal without a backbone |
| Gill | organ that allows a water-dwelling animal to exchange carbon dioxide for dissolved oxygen in the water |
| Symmetry | arrangement of individual body parts; can be radial (arranged around a central point), bilateral (mirror-image parts), or asymmetrical (no definite body shape). |
| Mollusk | soft-bodied, bilaterally symmetrical invertebrate with a large, muscular foot, a mantle, and an open circulatory system; usualy has a shell. |
| Medusa | free-swimming, bell-shaped body form in the life cycle of a cnidarian. |
| Mantle | thin layer of tissue that covers a mollusk's body and that can secrete a shell |
| Cells | Animals are composed of many eukaryotic _____. |
| Food | Animals must find and digest their own _____. |
| Symmetry | arrangement of parts |
| Radial symmetry | parts are arranged in a circle around a central point |
| Bilateral symmetry | parts are mirror images of each other |
| Asymmetrical | no definite shape |
| Veretebrates | animals with a backbone |
| Invetebrates | majority of animals which lack a backbone |
| Sponges | don't move to find food since adults are sessile or stuck in one place |
| Filter Feeders | filter food out of water that flows through body |
| Pores | let water into central cavity |
| Flagella | keep water moving through sponge |
| Spicules | soft sponge bodies are protected by sharp_____ |
| Spongin | other sponges have a material called |
| Sponges | reproduce sexually and asexually |
| Asexual reproduction | a new sponge grows from pieces of an old sponge |
| Hermaphrodites | most sponges that reproduce sexually are |
| Cnidarians | have tentacles and hollow bodies |
| Polyp | cnidarians are usually sessile and have vase-shaped bodies |
| Medusa | body is free-swimming and bell-shaped |
| Budding | polyp forms reproduce asexually by |
| Egg or Sperm | some polyps also reproduce sexually by releasing |
| Medusa forms | have a two stage life cycle in which they reproduce both sexually and asexually |
| Flatworms | search for their food |
| organs | Flatworms have long, flattened bodies with ________ and systems |
| Parasites | most are ___________ living off or in a host |
| Tapeworm | a type of flatworm |
| Digestive | Tapeworms lack a ___________ system and absorb nutrients from the host's intestines |
| Sexually | tapeworms reproduce |
| Roundworms | body is a tube within a tube |
| Roundworms | has both a mouth and an anus |
| Diets of roundworms | vary with some roundworms being decomposers, some predators, and some parasites |
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