Why are photosynthesis and cellular respiration important for living things?

Through these processes, plants obtain the carbon dioxide they need and livingorganisms obtain the oxygen they need. They are also necessary to the energy exchange that living things need to survive. ... While photosynthesis requires energy and produces food, cellular respiration breaks down food and releases energy.

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.