About 3.9 ev of energyis requiredto break apart or severely damage a dna molecule. when we damage our skin cells, our bodies respond by directing a lot ofblood to repair and replace the damaged cells, and our skin takes on a bright red glow(the tell-tale signs of sunburn). we also increase our risk of skin cancer.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Ibelieve the answer is d. macula  hope my answer has you : )

Dformation of a precipitate

Texas-flood watch and coastal flood barrierscalifornia-try and look for under ground water stream