Life on Earth


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The Tree (Phylogeny) of Life
A brief introduction to the Phylogeny of Life
Other Extreme Earth Life
Until recently, it was generally held that life, specfically microbial life, occupied no deeper than several tens of meters into the Earth's crust.
Exploring the Environment
Has informative and well presented sections on global climate change and the greenhouse effect, the Florida Everglades and Forest Fires in Yellowstone.
Research Tools
Dictionary.com/life

Thesaurus.com/life

In-Depth
Life in the Ice
Some very good information on life at extremely cold tempertaures including life on Mars.
Life's Working Definition: Does It Work?
How to define "life" is a sweeping question that affects whole branches of biology, biochemistry, genetics, and ultimately the search for life elsewhere in the universe.
Is Life Digital or Analog?

Hydrothermal Vents

Life began on Earth at least 3.8 billion years ago

eNature: America's Wildlife Resource
America's Wildlife Resource, provided by the National Wildlife Federation.
Organizations
World Wildlife Fund
A good source of wildlife and environmental news and information on conservation programs.