Comparative Anatomy

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Comparative Anatomy Noun

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[kuhm-par-uh-tiv uh-nat-uh-mee]

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Comparative Anatomy

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The study of similarities and differences in the body structures of different species to understand evolutionary relationships and adaptations.

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Example: This image shows that animals like humans, whales, and birds have forelimbs with a similar bone structure, even though they are used for different tasks. This similarity suggests they share a common ancestor.

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Anatomy Noun

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[uh-nat-uh-mee]

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Anatomy

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The scientific study of the structure of organisms and their parts, including their systems, organs, and tissues.

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Example: This image shows a human skeleton with major bones labeled, introducing the concept of anatomy, which is the study of the body's structure.

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Homologous Structures Noun

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[hoh-mol-uh-guhs struhk-cherz]

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Homologous Structures

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Body parts in different species that are similar in structure because they were inherited from a common ancestor.

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Example: This image shows that the forelimbs of humans, cats, whales, and bats have the same basic bone structure, even though they have different functions.

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Analogous Structures Noun

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[uh-nal-uh-guhs struhk-cherz]

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Analogous Structures

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Body parts in different species that have a similar function but different structures, not inherited from a common ancestor.

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Example: A bird's wing and an insect's wing are analogous structures; they both allow for flight but have very different internal structures and evolutionary origins.

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Vestigial Structures Noun

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[ves-tij-ee-uhl struhk-cherz]

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Vestigial Structures

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Anatomical features or remains of structures that were functional in an ancestor but have lost their original function.

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Example: This diagram shows an animal's foot where the dewclaws are smaller and no longer used for walking, making them an example of vestigial structures.

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Common Ancestor Noun

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[kom-uhn an-ses-ter]

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Common Ancestor

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An ancestral species or group from which two or more different species are believed to have evolved or descended.

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Example: This diagram shows how two different groups, or lineages, can be traced back in time to a single shared ancestor, the point where their evolutionary paths split.

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Evolution Noun

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[ev-uh-loo-shuhn]

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Evolution

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The process of change in the heritable characteristics of biological populations over successive generations through natural selection.

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Example: This image shows how related species, Darwin's finches, evolved different beak shapes to adapt to various food sources, demonstrating evolution through comparative anatomy.

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Biological Classification Noun

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[bahy-uh-loj-i-kuhl klas-uh-fi-key-shuhn]

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Biological Classification

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

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Example: This diagram shows biological classification, a system scientists use to organize living things into a hierarchy from the most general group (Life) to the most specific (Species).