.  Classification is the arrangement of organisms into orderly groups based on their physical similarities  Classification is also known as taxonomy.

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 Classification is the arrangement of organisms into orderly groups based on their physical similarities  Classification is also known as taxonomy  Taxonomists are scientists that identify & name organisms 2

 What types of organisms can be classified?  How are organisms classified?  How is a dichotomous key used to classify an organism?

 What’s this: A puma? A mountain lion? A cougar? A panther?

 Developed by Carolus Linnaeus  2 word naming system; each species is assigned a two-part scientific name (Latin origin)  Always written in italics  First word Capitalized, second word lowercase:  Genus species  Genus = a group of closely related species  Ex.: Brown Bear = Ursus arctos Polar Bear = Ursus maritimus Genusspecies

 Domain = Eukarya (cells with nuclei)  Kingdom = Animalia (animal)  Phylum = Chordata (backbone)  Class = Mammalia (hair, mammary glands)  Order = Primates (can climb trees)  Family = Hominidae (walk erect)  Genus = Homo (man)  Species = Sapiens (wise)  Human scientific name = Homo sapiens  Remember: Dumb King Phillip came over for grape soda!

So…Why Classify?  TO give universal names to organisms  TO organize organisms into groups  TO find relationships between organisms