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chp4 lesson 3&4
| Term | Definition |
|---|---|
| cnidarian | they are invertebrates that have stinging cells and take food into a central body cavity |
| what are some examples of cnidarian's | jellyfish & coral |
| mollusk | soft, unsegmented bodies that are often protected by a hard shell. |
| arthropod | have hard outer coverings, segmented bodies, and pairs of jointed appendages |
| echinoderms | has internal skeleton and a system of fund filled tubes |
| endoskeleton | internal skeleton |
| what are the main invertebrate groups? | sponges,cnidarian , mollusk, arthropods, roundworms,echinoderms, segmented worms, and flatworms |
| Mantle | a thin layer of tissue in the mollusk |
| what are 3 major groups of mollusk? | Gastropod(snail), Bivalve (clam), and a Cephalopod ( squid) |
| exoskeleton | outer skeleton |
| chordate | has 3 characteristics : notochord, a nerve chord, and pouches in the throat area |
| notochord | is a flexible rod that supports a chordates back |
| vertebrate | stacks of many small bones |
| ectotherm | an animal that produces little internal body heat |
| endotherm | is an animal that controls the internal heat it produces and regulates at its own temperature |