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Sneezing is the method some viruses spread (normally flu ones). When you are infected, and you sneeze, the viruses a dispersed in the air and the person that breathes he infected air might get infected.
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Answer:
They provide energy because photosynthesis makes sugar (glucose) which results into ATP(energy). In CR (cellular resp), oxygen is broken down during the process of photosynthesis and is used in CR to make water with hydrogen bonds.
I think it is true not 100% sure but i believe it is true <span />