The ocean of the Ordovician period seethed with life
Ocean water was subtropically warm and the ocean of the Ordovician period seethed with life: there were mussels and cuttlefish representing molluscs, sea lilies belonging to the echinoderms, various poriferous animals, sponges, bryozoans and other invertebrates, as well as early jawless fish. All the main phyla had already developed.
At the boundary of land and water heaved great masses of algae, and the first plants moved from water to land.
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