primitivan

primitivan

Refers to a character or feature in a group of organisms that is inherited from a common ancestor. Teeth are a primitive characteristic of birds since birds inherited them from their dinosaur ancestors.

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Loại từ: adjective
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Ngành nghề/Lĩnh vực: Biology
Category: Genetics
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evolucija

Biology; Genetics

Darwin's definition: descent with modification. The term has been variously used and abused since Darwin to include everything from the origin of man to the origin of life.

evoluciono stablo

Biology; Genetics

A diagram which depicts the hypothetical phylogeny of the taxa under consideration. The points at which lineages split represent ancestor taxa to the descendant taxa appearing at ...

istrebljenje

Biology; Genetics

When all the members of a clade or taxon die, the group is said to be extinct.

hijerarhija

Biology; Genetics

A series in which each element is categorized into successive ranks or grades with each level subordinate to the one above.

homologija

Biology; Genetics

Two structures are considered homologous when they are inherited from a common ancestor which possessed the structure. This may be difficult to determine when the structure has ...

hipoteza

Biology; Genetics

A concept or idea that can be falsified by various scientific methods.

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svetiana

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Ngành nghề/Lĩnh vực: Aerospace Category: Space flight

svemirski šatl

A reusable spacecraft with wings developed by the U.S. National Aeronautics and Space Administration (NASA) for human spaceflight missions. The first ...