I want to know the answer to the following question:
The Cambrian period was how long ago?
All the background I'm provided with is that "All bilaterians are thought to have descended from a common ancestor that appeared early in the Cambrian period, 485-540 million years ago, and it has been hypothesized that this common ancestor had the shape of a simple tubeworm with a segmented body.". Is that enough to answer the question?
Answer: yes