Yes. See https://www.smithsonianmag.com/smart-news/one-oldest-known-animals-tiny-ancient-sponge-180954523/ https://www.smithsonianmag.com/smart-news/one-oldest

Yes. See https://www.smithsonianmag.com/smart-news/one-oldest-known-animals-tiny-ancient-sponge-180954523/ https://www.smithsonianmag.com/smart-news/one-oldest-known-a... for a fossil of an arguable animal that at 600 million years predates this one. In fact we have evidence that the sponge/other animals split was one of the early taxonomic splits to happen, so it seems likely to me that Dickinsonia could be an ancestor of every animal EXCEPT sponges. Which may well have naturally developed from colony organisms like Stromatolites. (Which in turn date back over 3 billion years.)