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what is an animal
Lesson 3
Question | Answer |
---|---|
cnidarian | Invertebrates that have stinging cells and take food into a central body cavity |
Mollusk | Invertebrates with soft unsegmented bodies that are often protected by a hard shell |
Arthropod | invertebrates that have hard outer coverings segmented bodies and pairs of jointed appendages |
Exoskeleton | Outer covering |
Echinoderm | Invertebrate with a internal skeleton and a system of fluid filled tubes |
endoskeleton | Inner covering |