The term ecosystem was created in 1935 by Sir Arthur George Tansley, an English ecologist, who said natural systems are constantly changing among their living and nonliving parts. Starting with the biosphere, there are several large categories of living communities called biomes. The biomes are made up of ecosystems. The living parts of an ecosystem, like the plants, animals, and bacteria found in soil, are known as a community. The physical surroundings, or biotic components, such …showed first 75 words of 6680 total…

…showed last 75 words of 6680 total…Examples are deer, sheep, grasshoppers, and zooplankton. 7.<Tab/>Old growth forest: virgin and old, second growth forests that are often hundreds, thousands of years old. Examples include forests of Douglas fir, giant sequoia, and coastal redwoods. 8.<Tab/>Pollution: undesirable change in the physical, chemical, or biological characteristics of air, water, soil, or food that can adversely affect the health, survival or activities of humans or other organisms.