Prehistoric ocean

Before large mammals, reptiles ruled the ocean. During the Mesozoic, the time period when dinosaurs roamed on land, many of these large creatures were the top predators in the ocean food chain and fed on fish, cephalopods, bivalves, and even one another. Pterosaurs, flying reptiles, were also a key part to Mesozoic ocean ecosystems because they also ate fish (Image Credit: Smithsonian Institution).

David Deamer welcomes a synthesis of what we know about the origins of life, as told by a master in the field.

In a move reflective of a viral meme, a new study shows that an ancient fish really did evolve to walk out of the water, only to then go back to the sea.

Pre Cambrian ocean

National Museum Wales, Cardiff