Trilobites look up silently from their Burgess Shale rock slabs, with sad eyes, asking, “Where did I come from?”
The “selectivity filters” in membrane channels of living cells are able to discriminate between very similar molecules or atoms using complex mechanisms.
Simple, small, and worldwide in distribution, the placozoa don’t fit any clear evolutionary picture.
The nucleus is a beehive of activity, where information is not just stored but processed, protected, transcribed, and duplicated by highly complex machines.
True arthropods are among the most sophisticated animals that appeared without ancestors in the Cambrian explosion.