Seas
Seas
seas
During the early Paleozoic era, marine invertebrates such as trilobites dominated. In the middle Paleozoic, fish and early land plants became more prominent. By the late Paleozoic, amphibians, reptiles, and forests of ferns and seed plants were thriving.
The Paleozoic Era, because rich fossil evidence displays that early life in the time of the Paleozoic Era, there existed a dicersity of marine life.
During the Paleozoic Era, Africa was part of the supercontinent called Gondwana. Gondwana was located in the Southern Hemisphere and covered present-day continents such as Africa, South America, Antarctica, Australia, and the Indian subcontinent. Africa was situated towards the center of Gondwana during this time.
The Precambrian life forms were less developed than the Paleozoic life forms.
The Paleozoic Era.
The Paleozoic Era is also known as the age of ancient life.
The Paleozoic or Palaeozoic Era, "old" and zoe, "life", meaning "ancient life" is the earliest of three geologic eras of the Phanerozoic eon. The Paleozoic spanned from roughly 542 to 251 million years ago (ICS, 2004), and is subdivided into six geologic periods. (Wikipedia)For the source and more detailed information concerning your request, click on the related links section (Wikipedia) indicated directly below this answer section.
The Cambrian Period was from about 543 to 490 million years ago. It is the earliest period in the Paleozoic ("old life") Era. Until relatively recently paleontologists thought this marked the beginning of life. Primitive life is now know from the Pre-Cambrian Eon.
trilobites.
During the Paleozoic era, most life forms were concentrated in the oceans, particularly in shallow tropical seas. Marine life included trilobites, brachiopods, ammonites, and early fish species. Terrestrial life was limited to simple plants, fungi, and some arthropods.