k Urbilateria, illustration Illustration of Urbilateria, the hypothetical last common ancestor of bilaterian animals. Bilaterians are animals with bilateral symmetry, which means they have a head, a tail, and an upper and lower side, as well as left and right sides. The majority of animal life on Earth has bilateral symmetry., by GREGOIRE CIRADESCIENCE PHOTO LIBRARY Stock Photo - Afloimages
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Urbilateria, illustration Illustration of Urbilateria, the hypothetical last common ancestor of bilaterian animals. Bilaterians are animals with bilateral symmetry, which means they have a head, a tail, and an upper and lower side, as well as left and right sides. The majority of animal life on Earth has bilateral symmetry., by GREGOIRE CIRADE SCIENCE PHOTO LIBRARY
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Urbilateria, illustration

Illustration of Urbilateria, the hypothetical last common ancestor of bilaterian animals. Bilaterians are animals with bilateral symmetry, which means they have a head, a tail, and an upper and lower side, as well as left and right sides. The majority of animal life on Earth has bilateral symmetry., by GREGOIRE CIRADE/SCIENCE PHOTO LIBRARY

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