Which factor will decrease photosynthesis?

Light and heat temperature will decrease photosynthesis

Amount of light and amount of CO2 available to the plant may alter glucose production. 

The correct answer is  b) 

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.