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animal friends
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Animal Friends

History of classification
Aristotle divided the living world between animals and plants, and this was followed by Carolus Linnaeus (Carl von Linné), in the first hierarchical classification. Since then biologists have begun emphasizing evolutionary relationships, and so these groups have been restricted somewhat. For instance, microscopic protozoa were originally considered animals because they move, but are now treated separately.
In Linnaeus's original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Reptila, Aves, and Mammalia. Since then the last five have all been subsumed into a single phylum, the Chordata, whereas the various other forms have been separated out. These information represent our current understanding of the group, though there is some variation from source to source.

File information
Filename:231649.jpg
Album name:Fauna & Flora
Rating (1 votes):55555
Keywords:#animal #friends
Filesize:53 KiB
Date added:Jan 29, 2010
Dimensions:700 x 517 pixels
Displayed:18 times
URL:displayimage.php?pid=231649
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