Scientists Solve the Mystery of When Earth’s Oldest Animals Evolved

New research suggests Earth’s earliest sponges lacked skeletons, explaining why their origins appear older than the fossil record. Sponges are considered some of the oldest animals on Earth, yet researchers have struggled to pin down when they first appeared. Studies of DNA from modern sponges, together with chemical clues preserved in ancient rocks, point to [...]

from SciTechDaily https://ift.tt/hUc6azI