Ancient Jellyfish Could Overturn Animal Family Tree

Scientists found comb jellies are the deepest branch on the animal family tree, preceding sponges.
A new method using DNA tracked how genetic material moved in chromosomes of nine animals.
Early animals may have had nervous systems and muscles, not been simple sponges.
Researchers are studying comb jellies' nervous systems to see how they're similar to and different from other animals'.
Comb jellies might have evolved their own strange nervous systems separately using some of the same ingredients as other animals.