Dichotomous Keys

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Classification Noun

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[klas-uh-fi-kay-shun]

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Classification

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The systematic process of grouping organisms into categories based on their shared characteristics and evolutionary relationships.

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Example: This diagram shows the levels of biological classification, from the broadest category (Domain) to the most specific (Species), arranged in a hierarchy.

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Taxonomy Noun

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[tak-son-uh-mee]

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Taxonomy

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The scientific branch concerned with the principles of classification, including the naming and identification of organisms.

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Example: This diagram shows taxonomy, the science of classifying organisms. It uses a pyramid to show how living things are sorted from broad groups (Domain) to specific ones (Species).

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Speciation Noun

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[spee-see-ay-shun]

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Speciation

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The evolutionary process by which populations evolve to become distinct, reproductively isolated biological species.

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Example: This diagram shows how one ancestor finch species, through natural selection, evolves into several new species with different beak shapes adapted for different food sources.

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Phylogenetic Tree Noun

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[fy-loh-juh-net-ik tree]

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Phylogenetic Tree

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A branching diagram that visually represents the evolutionary history and relationships among various biological species.

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Example: This image shows how different finch species are related through evolutionary history, illustrating the concept of a phylogenetic tree.

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Dichotomous Key Noun

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[dy-kot-uh-muhs kee]

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Dichotomous Key

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A tool used for identifying organisms by presenting a series of choices between two alternative characteristics.

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Example: This diagram shows a dichotomous key used to identify boys in a classroom by making a series of choices between two characteristics at each step.

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Dichotomous Adjective

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[dy-kot-uh-muhs]

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Dichotomous

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A term meaning 'divided into two parts,' referring to the paired, contrasting choices offered at each step.

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Example: This diagram shows a dichotomous key, a tool used to identify things by repeatedly splitting a group into two based on observable characteristics.

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Organism Noun

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[or-guh-niz-uhm]

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Organism

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An individual living entity, such as an animal, plant, or microorganism, that exhibits the properties of life.

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Example: This image shows several groups of organisms (mushrooms) with different features, which can be identified and sorted using a dichotomous key.

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Characteristics Noun

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[kar-ik-tuh-ris-tiks]

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Characteristics

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The specific, observable features or qualities of an organism used for its identification and classification.

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Example: This collection of different beetles highlights their unique features, or 'characteristics,' such as color, size, and antenna type, which are used to classify them.

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Anatomical Features Noun

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[an-uh-tom-i-kuhl fee-cherz]

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Anatomical Features

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The physical structures and body parts of an organism, often used as key characteristics in a dichotomous key.

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Example: This diagram shows the anatomical features of a flower, such as petals and stamens, which are used as characteristics to identify plants with a dichotomous key.