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Lesson three
| Question | Answer |
|---|---|
| Exoskeleton | External skeleton: a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates |
| endoskeleton | internal skeleton, structural support system within the body of an animal |
| Invertebrate | an animal without a backbone |
| eight main groups of invertebrates | sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, arthropods, and echinoderms |
| characteristics of each invertebrate group and animal example: Sponges | asymmetrical invertebrates, not tissue or organs; stay in one place, they take food into their bodies to get energy. Example: sea sponges, boring sponges. |
| Cnidarians | Cnidarians have stinging cells and take food into a central body cavity, have radical symmetry, lack organs but do have some tissues. Example: jellyfish and corals |
| worms | Worms Three types, flatworms, round worms, and segmented worms, have bilateral symmetry with tail and head, they have tissues, organs and organ systems. |
| mollusks | invertebrates with soft, unsegmented bodies that are often protected by hard shell, have thin layer of tissue. Example: snail, clam, squid. |
| arthropods | invertebrates that have hard outer coverings, segmented bodies, wings antennas and legs are appendages. Example: crabs, arachnid, spiders, insects. |
| echinoderms | invertebrate that has internal skeleton, system of fluid-filled tubes, radial symmetry, use system of tubes to move and get food and oxygen. Example: sea star, sea urchins, sea cucumber, brittle stars. |
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