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Animals Lesson 1 - 4

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Homeostasis   Keeping internal body conditions stable  
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Adaptions   Structures and behaviors that allow animals to perform their functions  
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Vertebrates   an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.  
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Invertebrates   an animal lacking a backbone  
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Tissue   A group of similar cells that perform specific function  
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Organ   a part of an organism that is made up of many tissues  
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Radial symmetry   symmetry around a central axis, as in a starfish  
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Bilateral symmetry   the property of being divisible into symmetrical halves on either side of a unique plane.  
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Cnidarians   Invertebrates that have stinging cells and take food into the central body cavity  
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Sponges   Asymmetrical invertebrates that have specialized cells but no tissues or organs  
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Mollusks   Invertebrates with soft, unsegmented bodies that are often protected by a hard shell  
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Arthropods   Invertebrates that have hard outer covering, segmented bodies, and pairs of jointed appendages  
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Exoskeleton   The outer covering  
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Echinoderm   Invertebrate that has an internal skeleton and a system of fluid-filled tubes  
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Endoskeleton   And internal skeleton  
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