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Study Guide for Habitats (3.6) *A POPULATION is a group of organisms of the same kind that live in the same place. *A COMMUNITY is all of the populations that live together in the same place. *WATER-RELATED ENVIRONMENTS include those with fresh water and salt water. Examples include ponds, marshes, swamps, streams, rivers, and oceans. *DRY-LAND ENVIRONMENTS include deserts, grasslands, rain forests, and forests. *OCEANS are Earth’s largest ecosystem. They make up three-fourths of Earth. *Oceans and seas contain SALT WATER. *Rivers, ponds, and streams contain FRESH WATER. *A DESERT is an area that gets very little rainfall. *An area in which the main plants are trees is called a FOREST. *A forest growing in a hot, rainy place is a TROPICAL RAIN FOREST. *Everything around a plant or animal is its ENVIRONMENT. *A forest of trees that form seeds in cones is a CONIFEROUS FOREST. *A forest of trees that lose and regrow their leaves each year is a DECIDUOUS FOREST. *The living and nonliving things that surround a living thing make up its ENVIRONMENT. *The place in an ecosystem where a population lives is its HABITAT. *An ECOSYSTEM is made up of all the living and nonliving things in an environment. *DESERTS are very dry ecosystems. *GRASSLANDS are dry, often flat areas of land that are hot in the summer and cold in the winter. *The three layers of the rain forest are CANOPY (top), UNDERSTORY (middle), and FOREST FLOOR (bottom). **How can damage to an ecosystem harm animals that live there? *Damage may kill living things in an ecosystem; damage may force living things to move to other ecosystems. **Nonliving things are part of an ecosystem. Why is this important? *Nonliving things provide some of the needs of living things.