Compare and contrast photosynthesis and cellular respiration. Why are the processes like two sides of the same coin?`

In photosynthesis reserve food material (starch) is prepared using CO2 and H2O .

In cellular respiration reserve food material is broken down into CO2 and produce energy.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

we would need to see the picture to answer it