Evolution
It is believed that bioluminescence has evolved more than 20 to 30 times among different groups of organisms.
Courtesy of NOAA.
Genes within populations, natural selection, unity and diversity of living organisms, speciation
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Evolutionary Theory
Slide Set
Overview of the history, key discoveries and scientists, and development of biological evolutionary theory.
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Modes of Speciation
Slide Set
Learn about speciation (the formation of new species) and how populations evolve genetic distinctiveness and become reproductively separate.
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Species Concepts and Reproductive Isolating Barriers
Slide Set
Scientists generally agree that organisms should be classified according to species. But as this slide set shows, the concept of “species” can be viewed in different ways.