All organisms need food, air, water, sunlight, and the right habitat. Organisms need to obtain nutrients from food. Air is the mixture of natural gases in the right proportions for each organism. While animals need oxygen for respiration, plants require carbon dioxide to manufacture food.
All organisms need food because it contains essential nutrients that body cells use for their growth, movement, and reproduction. Water is very important because it is the medium where vital nutrients and minerals enter the body. Without water, the cells and tissues of animals and humans would not function properly. At the same time, water is the natural habitat for such organisms as fish, crocodiles, hippopotamus, octopus, and other marine animals. The heat energy from the sun is perhaps the most important need for most organisms. While plants need sunlight for photosynthesis, animals need it for supply of energy. Every organism needs to be in the right habitat to survive. For example, polar bears only live in very cold areas of the world and cannot survive in hot environments. At the same time, fish only live in water and will die if left on dry land. Organisms can develop adaptive features to survive in their respective habitats. When the basic needs in their habitats are depleted, they move to another habitat or die.