We really see very little of the real life on earth. Countless billions of microscopic animals and plants surround us on every dive. These relatives of mankind have a kind of spinal cord and gills. We too have gill slits in the embryonic stage. This amazing life form is explained simply and clearly.
Bryozoans lace corals are beautiful living fossils.
Annelids, Flat worms, Spoon worms. Undersea flowers of deadly beauty. Sea spiders have hollow legs into whivh their stomachs go and the male carries the eggs. Sea stars, Feather stars, Sea urchins. Weird synthesis of mechano and living flesh.