Starfish, sandollars, sea urchin, and sea cucumbers. Invertibrates became dominant. The earlier face did not have jaws yet, they haven't developed. Around this time the earth was very tropical and almost entirely ocean. It had animals like red and green algae, primitive fish, chephalopods, corals, crinoids, and gatropods. The weather was mild climate an the weather was warm, and the atmosphere carried alot of moisture.