classifying living things. classifying – grouping things according to similarities taxonomy –...
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Classifying Living Things
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Classifying – grouping things according to similarities
Taxonomy – science of classifying and naming organisms
- The term is derived from the Greek taxis (“arrangement”) and nomos (“law”).
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Aristotle
Greek philosopher
Classified organisms into two kingdoms. Plant Animal
Animal Kingdom – divided into 3 groups
Air Land Water
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Problem with Aristotle’s system
Frogs
part of life in water
Part of life on land
Needed more logical and finer tuned classification system
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Carolus LinnaeusSwedish physician and naturalistCreated system to classify organisms based on similarities in body structures and systemsAlso; size, color, shape and methods of obtaining food
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6 Kingdoms of classification of organisms
Kingdom Monera – has been divided into;
Archaebacteria
Eubacteria
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Organisms are placed in each kingdom based on characteristics
Presence of nucleus
Single-celled
Many-celled
Ability to make food
Ability to move
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Finer classification
King
Phillip
Came
Over
For
Good
Spaghetti
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species
Smallest category of classification
Organisms within a species can reproduce and produce fertile offspring
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Naming of organisms
All organisms need an exact name
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Binomial Nomenclature-2 names
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Binomial nomenclature
Organism’s scientific name
Latin nameGenus name: group of different organism that have similar characteristics
always capitalized
Species name: more precise classification organisms belonging to
same species can mate
always lower case
No two organisms have the same name
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Canis familiaris
Domesticated dog
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Canis lupus
Grey wolf
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Canis latrans
Coyote
Latrans – barking dog
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Dichotomous key – tool used to identify organisms
Dichotomous means "divided in two parts".
At each step of the process of using the key, the user is given two choices;