photosynthesis produces food for plants
this requires carbon dioxide and water to react in the present of sunlight and also chlorophyll to produce glucose and oxygen
1.animals need the oxygen supplied for respiration
2.photosynthesis helps to balance the carbon dioxide content in air, it reduces the amount of carbon dioxide thereby reducing occurrence of global warming
3.also there are animals that depend on plants for their food ,herbivores,without photosynthesis the crop will die depriving the animal of its food supply