Why are photosynthesis and cellular respiration important?

cellular respiration is important because

 it provides cells with the energy they need to function. photosynthesis is important because it is the number one source of oxygen in the atmosphere

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes