BIOL211#1 - . . . surely we should realize, like the...

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Unformatted text preview: . . . surely we should realize, like the amateur, that the organic world is also an inexhaustible source of spiritual and aesthetic delight. And especially in the college we are unfaithful to our trust if we allow biology to become a colorless, aridly scientific discipline, devoid of living contact with the humanities. William Morton Wheeler Address as President of the American Society of Naturalists December 29, 1922 Chapter 26 The Tree of Life Overview Life is a continuum extending from the earliest organisms to the great variety that exist today Geological events that alter environments change the course of biological evolution Conversely, living things change the planet they inhabit Figure 26.1 Geologic history and biological history have been episodic and marked by what were in essence revolutions that opened many new ways of life Concept 26.2 The fossil record chronicles life on Earth The study of fossils opens a window into the lives of organisms that existed long ago and provides information about the evolution of life over billions of years...
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BIOL211#1 - . . . surely we should realize, like the...

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