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How are living thing organized for study?

Biologists use a classification system to name organisms and group them in a logical manner


Scientists classify organisms and assign each organism a universally accept the name

What is Linnaeus's system of classifciation?

Includes seven levels (smallest to largest) --> species, genus, family, order, class, phylum, and kingdom

Binomial Nomenclature

Developed by Carolus Linnaeus; it is a two-word naming system; each species is assigned a two-part scientific name; always written in italics and the first word is capitalized and the second word is lowercased


Group or level of organization into which organisms are classified


Group of genera that share many characteristics


Griyo if similar families


Group of similar orders


Group of closely related classes


Large taxonomic group, consisting of closely related phyla

How are evolutinary relationships important in classification?

Biologists now group organisms into categories that represent lines of evolutionary descent, or phylogeny, not just physical similarities

How can DNA and RNA help scientists determine evolutionary relationships?

The genes of many organisms show important similarities at the molecular level; similarities in DNA can be used to help determine classification and evolutinary relationships


Evolutionary relationships among organisms

Evolutionary Classification

The strategy of grouping organisms together based on their evolutionary history

Derived Character

Characteristics that appear in recent parts of a lineage but not in its older members


A diagram that shows the evolutionary relationships among a group of organisms

Molecular Clock

Uses DNA comparisons to estimate the length of time that two species have been evolving independently

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