[Free Registration/Login may be required to access all resource tools.] An organism goes extinct when all of the members of a species die out and no more members remain. Extinctions are part of natural selection. Species often go extinct...

This site is provided for by The Franklin Institute Online. "Open the door and step into your ecosystem." Content describes ecosystems and related material such as biomes, habitats, energy cycle, extinction, recycling, and more.

[Free Registration/Login may be required to access all resource tools.] Explains how natural selection favors certain traits in a population so that the organism adapts to its environment, and that changes in the genes over time cause...

Learn about how and where tigers live when you explore this resource. You can also investigate how tigers communicate with each other, enemies, friends, and humans through this site.