what distinguishing factor marked the beginning of the paleozoic era? bacteria and single celled criters…

what distinguishing factor marked the beginning of the paleozoic era? bacteria and single celled criters first appeared in fossil records. fossils looking sometimes like plants appeared. small animal fossils indicated that they had shells

what distinguishing factor marked the beginning of the paleozoic era? bacteria and single celled criters first appeared in fossil records. fossils looking sometimes like plants appeared. small animal fossils indicated that they had shells

Answer

Brief Explanations:

The Paleozoic Era is marked by the appearance of small - shelled animals in the fossil record. Bacteria and single - celled organisms appeared much earlier, and plant - like fossils also pre - date the start of the Paleozoic.

Answer:

Small animal fossils indicated that they had shells