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BIOL 121 (154)
Lecture

Evolution 2.docx

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Department
Biology
Course
BIOL 121
Professor
Carol Pollock
Semester
Winter

Description
th Evolution 2: Evidence for the evolution March 5 , 2012 - The Theory of Evolution has not been “proven” but it has not yet been disputed, therefore it is the best theory we have to date - Evidence for Darwin’s theory, The Decent with modification 1. Species can change through time Past organisms a. Fossil records – imprints of organisms in the rock stratum (each stratum represents a geological time era), usually the “hard parts” of organisms are left behind (ex. Shells) or sometimes tracks *Through these tests the Earth has been determined to be ~4.6 billion years old Billions of years ago = bya Millions of years ago = mya *It is estimated that life first emerged ~3.5bya b. Extinctions – species that were once here and are
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