When looking up Cambrian Period information you'll get flooded with Creationist Intelligent Design propaganda. Stuff that freely misrepresents the facts and their "opponents," instead coming up with disconnected just so stories in complete disregard of the full spectrum of available understanding - so beware.
That is why I'm sharing this comment that I originally penned for a discussion over at Center For Inquiry's Forum. It belongs here since a better understanding of the difference between religious thinking and serious scientific thinking is worth trying to push into the public consciousness! (edited 9/19/19 evening)
The challenge is clarifying the key difference between Religious Thinking and Scientific Thinking. Both of which are products of our Human Mindscape.
It starts with acknowledging that all we see and experience, is through our senses and then processed by our brains to the best of our individual learning and abilities.
The "Mindscape" is just that, our mind, the product of our body, nerves, brain and all we sense along with our emotions and thoughts.
Religions are all about our “Mindscape" itself, with it's constant dialogue and self-story telling and fears, emotions and needs. Its freedom to poetically tie together whatever it wants. It is the realm of the metaphysical thoughts and daydreaming and story telling.