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Proteins can be catalysts which help to reduce the energy used in a chemical reaction or speed it up. Proteins can help carry oxygen throughout the body in the form of hemoglobin 
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Answer:
Lets say you are running in P.E. If you run for to long you get tired. When you are tired you run out of energy and cant run anymore. 
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Answer:
dead squirell
Explanation:
it used to be alive so that why
 
        
             
        
        
        
 from what I can see from my research they are also called monosaccharides. 
Hope it helped:)