Did the first animal look like a sponge or a comb jelly? The debate continues.
November 19, 2025
Two years ago, a novel analysis by UC Berkeley researchers pointed to comb jellies as the root of the animal tree of life. Another Berkeley group now says it’s sponges. Photo by Alison Yin, courtesy of HHMIBiologists who study the evolutionary origin of animals got a bit of a surprise this month when a new…