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6th grade

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
cell   the basic unit of structure and function in a living thing  
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cell membrane   forms the outside boundary of the cell  
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nucleus   the control center that directs the cell's activities  
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What are the levels of organization in the human body from smallest to greatest unit?   cells, tissues, organs, and organ systems  
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organ systems   the human body is made up of eleven organ systems: circulatory, digestive, nervous, skeletal, endocrine, muscular, excretory, respiratory  
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muscle tissue   can contract or shorten--muscle tissue makes parts of your body move  
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nervous tissue   carries electrical messages back and forth between the brain and other parts of the body  
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Created by: dianadarlene
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