Image: Origin of major organs on the animal phylogeny
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Description: This phylogeny (relationship tree of animals) depicts examples of major animal lineages, and their relationship. Against this phylogeny specific organs are noted. As can be seen most animal organs evolved a very long time ago. Also, almost all organs evolved only once in all animals. This means that studying how organs evolved in animals is a very difficult problem to study.
Title: Origin of major organs on the animal phylogeny
Credit: Own work
Author: OliGriffith
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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