By Yelena Mandenberg Locals in Oklahoma discovered large, jelly-like sacs with a hard exterior hanging from tree roots; they immediately thought the answer was extraterrestrial. Or at least not good news. But scientists, reassuring the public, have said that the locals in the area got a rare treat – the glimpse of the reproductive system of an ancient animal that’s been around since before the dinosaurs. Immediately, locals put it up online, and spectators began commenting on the extraterrestrial-looking eggs. But scientists say that the creatures were simple bryozoans. They’ve been around for…