Timeline: Life on Earth #1: Extinctions of Living Things

This series explains how the diversity of life on Earth has developed over millions of years, through a combination of gradual change and dramatic events. It reinforces student knowledge about the survivability of plants and animals in environments and provides a substantial background on the earth sciences, such as geological processes. It looks in depth at biological adaptation over time. Topics covered include: genetic variation and mutation; the role of environmental change both gradual and catastrophic; competition for resources; the distribution of organisms; the extinction of species; geological and fossil evidence; comparative anatomy; theories of evolution; and scientists at work today.