organisms interacting with their physical environment
The community of living things interacts with the non-living world around it to form the ecosystem. niche: a job that an organism holds in a community Because resources like water and food may be limited, plant and animal species often compete with each other for food and water.
a living thing that can act or function independently
Some other animals need only a small amount of space and can put up with neighbors that live close. population: the total of living organisms in a given area Just like you have to go to the store to get food, an animal leaves its "shelter" to get the things they need to live.