skin - largest body organ, cells - your body replaces these when they die, circulatory system - this system circulates blood to all other systems, organs - these are made of body tissue and groups of similar cells, microscope - used to view microscopic organisms, respiratory system - this system is responsible for carrying oxygen to the lugs, lens - curved piece of glass used to magnify objects, muscle tissue - the softest and most abundant tissue in the human body, bacteria - a tiny one-celled organism that Anton van Leeuwenhoek,

Human Body Riddles

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