Question

How are structures found in fossilized animals from the Precambium different from structures that appear in the Cambrian fossils?

Answer 1

Precambrian evolution is otherwise called ediacaran period which is 635 to 543 million years ago. Animal life during those period arise from protists such as choanoflagellates. Animals in that era is believed to have tiny, sessile and soft bodied sea creatures. Whereas animals in cambium era is 542 to 488 million years ago. Echinoderms, mollusk, orthropod and works were arose during cambium period. Among that, most dominant species was trilobite, an orthropod, the first animal which senses vision.