Darlings of the Cambrian Explosion, trilobites had spotted markings and sophisticated eyes. Some have been exceptionally well preserved as fossils, down to the level of individual cells.
Biomimetics puts a new meaning into "Make like a tree." Yes, make things like trees, snails, fireflies, and a thousand other creatures do, and life can be inspiring.
For professionals who should be concerned with evidence, many evolutionists are given to rampant speculation. The tipoff is usually a phrase like "may have," "could have," or "conceivably."