three-dimensional, a disaster, A very bad event, like a big fire, flood, or earthquake., natural resources, Things from nature that people use, like water, trees, and oil., waste, Things we throw away because we don’t need them, like trash or garbage., skin, The outside part of your body that covers everything., the lungs, The parts inside your chest that help you breathe., a cell, A very small part of the human body., the heart, The part inside your chest that pumps blood through your body.

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