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Biology Ch. 20
lsue biology 1202
7
Biology
Undergraduate 1
02/10/2012

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scientists have named about 1.8 million species of an estimated 4 to 100 million existing species
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more than 99.9% of all species are now extinct
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early ancestors of all species were few simple unicellular organisms 3 to 4 billion years ago
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1700s: Linnaeus founded modern taxonomy, science of naming, describing, and classifying organisms
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morphological species concept: classification of plants and other organisms in separate categories
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morphological species concept separates species based on their visible differences, such as feathers or number of flower parts
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evolutionary biologist Ernst Mayr first expressed biological species concept in 1942
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