"Life on earth is constantly changing. It has been doing so for as long as we know and far before humans were here. Through the use of detailed case studies and scientific theories, Timeline: Life On Earth discusses how changes are studied, what the evidence reveals, and how such changes have had-and continue to have-an impact on earth. Changing Ecosystems explains the complexities of different ecosystems on earth. Learn how organisms interact with their environment and how this varies when the characteristics of an ecosystem changes. Compare the ecosystems of the past, which led to mass extinctions and Ice Ages, with more recent devastating El Nino events, roaring wildfires, and explosive eruptions."
"Explores how the earth's ecosystems have changed throughout history, describing how environmental and manmade changes have influenced ecosystems and the plants and animals that live in them."
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