The diagram gives timing, family relationships and significant innovations in the development of terrestrial intelligence. With the advent of learned behavior in mammals and birds, DNA lost a significant part of its job. More than half of what makes a modern human being is passed culturally. A billion years ago, before brains or eyes were invented, when the most complicated animals were something like hydras, double layers of cells with a primitive nerve net, our progenitors split with the invertebrates. Now both clans have intelligent members.
Cephalopods are the most intellectual invertebrates.
Most mollusks are sessile shellfish, but octopus and squid are highly mobile, with big brains and excellent eyes. Evolved independently of us, they are different. The optic nerve connects to the back of the retina, so there is no blind spot. The brain is annular, a ring around the esophagus. The green blood is circulated by a systemic heart oxygenating the tissues and two gill hearts moving depleted blood.