How does photosynthesis affect the flow of energy in a biosphere?

The biosphere is the combination of the all the ecosystem present on the earth.

In a biosphere the plants are the organism, which convert the energy of the sunlight in to food (usable form of energy for the consumers) by the process of photosynthesis. The food is transferred from the the producers (plants) to the animals (consumers).

In case, the photosynthesis does not occur, the organism present in the biosphere cannot utilise the energy.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.