The early vertebrates

The early vertebrates
in the Paleozoic era
millions of years ago
in Cambrian, Ordovician, Silurian and Devonian times
there lived in the oceans
the early vertebrates

In the Paleozoic era
millions of years ago
during the so called Cambrian explosion
there evolved in the oceans
small tapered streamlined animals
showing eyes, a notochord and a brain
small tapered streamlined animals
the early vertebrates

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