Science3.6 Crossword
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
                      
 
 
Down: 1) the main bone that runs along the middle of the back on some animals2) behavior an animal is born with4) behavior caused by a stimulus7) animal that usually has hair and feeds milk to its young8) the cause of a behavior10) a simple automatic behavior Across: 3) hard outer covering that supports and protects some animals without backbone5) way a living thing acts6) one of a large group of animals with backbones that live part of their lives in water and part in land9) to shed an animas outer covering10) an animal with a backbone that has dark, scaly skin11) ogans for breathing found in fish and amphibians
 

 

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