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Answer:
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This lesson is part of a two-part series on endangered species. The first lesson, Endangered Species 1: Why Are Species Endangered? introduces and explores the various issues and problems faced by endangered species globally. The second lesson, Endangered Species 2: Working to Save Endangered Species, may be done sequentially or independently, since it focuses less on the science and more on the actual work of saving endangered species.
The earth is comprised of many different life forms, including plants, animals, humans, and other organisms. These various life forms are highly interdependent and have formed important systems that continually reshape the planet's landscapes, oceans, and atmospheres.
Booming human population growth over the last two centuries has put, and continues to put, many of these life-sustaining systems out of balance and in serious jeopardy, endangering many of the plant and animal species that human beings directly and indirectly depend upon for long-term survival.
Bigger human populations naturally mean increases in human activities worldwide, leading to changes in landscapes, oceans, atmospheres, and the path of human history. For example, as noted in the benchmark of this lesson, human activities like reducing the amount of forest cover, increasing the amount and variety of chemicals released into the atmosphere, and intensive farming, have changed the earth's land, oceans, and atmosphere. Some of these changes have decreased the capacity of the environment to support some life forms. (Science For All Americans, p. 46.)