FASCINATION ABOUT ANIMALES

numerous animal phyla 1st look within the fossil file in the course of the Cambrian explosion, commencing about 539 million years in the past, in beds like the Burgess shale.[ninety six] Extant phyla in these rocks include things like molluscs, brachiopods, onychophorans, tardigrades, arthropods, echinoderms and hemichordates, coupled with quite a