Cambrian

was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 55.6 million years from the end of the preceding Ediacaran Period 541 million years ago  to the beginning of the Ordovician Period 485.4 mya.

flora and fungi
the world of plants and fungi was not yet developed like animals, simple algae and fungi still prevailed

animals
In the early Cambrian there was an event known as the Cambrian explosion. ← see this article