Food An organism needs food because, without food the organism will die. An organism needs food daily. With the food they eat, they get nutrients so they won't become sick.
WaterAn organism needs water to survive because they can get dehydrated and die. If an organism doesn't drink water, their kidney's will fail and will possibly cause their death. without water they will not have energy to be able to hunt with.
Sunlight An organism needs sunlight because they get vitamin d from the sunlight. without sunlight the organisms food will not contain vitamin d. Vitamin d can also be beneficial for the organism.