Are Comb Jellyfish Humans' Oldest Ancestors? Sea Walnut Is 'Crucial' To Evolution, Scientists Say

Every now and then, scientists go in and spruce up the ancestral tree of human evolution. The most recent pruning turned up something odd about the origin of life on Earth. Scientists studying the genomes of aquatic life forms found that the comb jelly, a gelatinous marine animal closely related to the jellyfish, is the oldest multicellular animal on our planet - a position previously occupied by sea sponges.