National Geographic Crossword
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
                  
 
 
Down: 1) at rick of becoming extinct2) a protein used by the immune system to fight infections3) a type of tiny germ that can cause disease5) an area where a living thing gets what it needs to survive9) no longer living11) the surface of the Earth13) a giant piece of Earth's crust Across: 4) a tiny organism made up of one cell6) partly melted rock inside the Earth7) the living and nonliving things that make up an environment, and have an effect on each other8) the body system that protects you against disease and infection10) the layer of Earth between the crust and the core11) the center of the Earth12) a group of living things that share common characteristics14) melted rock that flows from a volcano15) the smallest and most basic part of a living thing
 

 

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