Photosynthesis is a process of formation of food (carbohydrate) in green plants and algae using inorganic molecules that are carbon dioxide and water in the presence of energy from sunlight.
It occurs in specialized membrane bound organelles, called chloroplast.
In this process, oxygen is released as waste product in the surrounding and sugar (food) produced is utilised as chemical energy by the organism.
When bacteria decompose, they leave behind nutrients. These nutrient then filter unto the roots of the plants via the water that it sucks up. A loss in certain nutrients could be the death of this plant.
It is quite possible that introducing a new predator to the food chain may set it off balance. The cougar will flourish in southern Alabama based on the circumstances given above because of the high availability of deer. The introduction of the cougar will decrease the deer population overall.