Pronephros

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Pronephros is the most basic of the three excretory organs that develop in vertebrates, corresponding to the first stage of kidney development. It is succeeded by the mesonephros, which in fish and amphibians remains as the adult kidney.

Excerpt from the Wikipedia article “Pronephros”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bridgette E. Drummond, Wesley S. Ercanbrack, Rebecca A. Wingert, CC BY-SA 4.0, via Wikimedia Commons.