Answer:
The strong connection between photosynthesis and cellular respiration can be found everywhere in the Earth. This is because the reactants of the cellular respiration are the products of photosynthesis and vice versa.
The equation of photosynthesis can be summed up as:
6CO2 + 6H20 + (energy) → C6H12O6 + 6O2
Carbon dioxide + water + energy from light → glucose and oxygen
The equation for cellular respiration can be summed up as
C6H12O6 + 6O2 → 6 CO2 + 6H2O + ATP
glucose +oxygen → Carbon dioxide + water + energy
As the equation shows, both the reactions are opposite to each other and hence hold a strong connection.