Cambrian.
The Paleozoic Era of geologic history occurred before the Mesozoic Era.
Paleozoic era
Mountains first appeared in the Paleozoic Era.
The 4 eras are Cenozoic era, the mesozoic era, the paleozoic era, and the precambrian era.
Warm, shallow seas covered most of Earth's surface near the end of the Paleozoic Era.
No Paleozoic is not the second era it is the first era
Paleozoic Era
The first period in the Paleozoic Era was the Cambrian.
paleozoic
The Paleozoic Era of geologic history occurred before the Mesozoic Era.
Fish first developed in the Paleozoic Era
the PALEOZOIC era
the paleozoic era
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.
Never. The paleozoic era was about 540 millionyears ago - America was founded in 1776.
Reptiles first appeared during the Paleozoic Era, specifically the Carboniferous System of the Paleozoic Era. That was about 320 million years ago.
Paleozoic era