Gappa 7th Science Chp 6
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| virus | a small nonliving particle that invades and then reproduces inside a living cell
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| host | an oranism that provides a source of energy or a suitable environment for a virus or an other living organism
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| fossil | the preseved remains or traces of an orangism that lived in the past
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| homologous structure | body parts that have similar structures in related species; provide evidence that the structurtes were inheried from a common ancestor
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| branching tree | a diagram that shows how scientists think difference groups of oranisms are related; the closer organisms are on the tree, the closer they are related
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| binomial nomenclature | the naming system for organism is given a two-part name- a genus name and aspices
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| classification | The process of grouping things based on their similarities.
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| taxonomic key | A series of paired statement that describe the physical characteristics of different organisms. Used to identify the names of different organisms.
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| leavels of classification | Kingdom, Phylum, class, order, family, genus, species.
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| baceteria | A single celled organism that does not contain a nucleus; the genetic material just floats around in the cytoplasm.
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| 3 shapes of bacteria | rods, spheres and spirals
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