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Ecosystems and Habitats Ecosystems • When you walk in nature you see many things. • Some of these things are alive, like animals and plants. • Some of these things are not alive, like rocks, air, and water. • An ecosystem is all the living and nonliving things interacting in an environment. Habitats • A habitat is the environment that meets an organism’s needs (or a home). • In a habitat some needs are met by other living things. For example, a tree provides food and shelter for a woodpecker. • In a habitat some needs are met by nonliving things. For example, plants need water, nutrients in the soil, carbon dioxide, and sunlight to grow. Habitats • A habitat has to provide for the organisms that live there. If there is not enough food and water animals will have to move somewhere else or they will die. Habitats • Different habitats provide the needs for different animals. • A pond is a habitat for fish, frogs, and lily pads. • Areas in Alaska are habitats for polar bears and arctic foxes. Niche • A niche is the role that an organism plays in its habitat. Species • A species is a group of organisms that can mate and produce offspring like themselves. Populations • All the organisms of the same species that live in the same place at the same time are a population. Communities • Populations that live in the same place at the same time make up a community. Interactions in a community • Populations within a community interact with one another. • For example, sharks interact with the fish they eat. • Populations also compete with each other for food and places for shelter. • For example lizards and frogs both eat insects. Questions What is a habitat? A habitat is the specific environment that meets an organism’s needs What is a niche? A niche is the role that an organism plays in its habitat