The Paleozoic came before the Mesozoic.
Yes, the Cambrian Period was before the Mesozoic Era
The Paleozoic era was from 540 million years ago to about 245 million years ago. After that came the Mesozoic era, and that lasted from the end of the Paleozoic to 65 million years ago, when the earth entered the Cenozoic era.
Mesozoic
The current era is Cenozoic era. The preceding era was Mesozoic era. However if you are looking for periods in Cenozoic era, the current one is Neogene period, the preceding period was paleogene period.
The Cenozoic era was not a subdivision of the Mesozoic era. The Mesozoic era is subdivided into the Triassic, Jurassic, and Cretaceous periods.
Mesozoic Era
The Paleozoic precedes the Mesozoic. And our current era, the Cenozoic, follows the Mesozoic.
Yes they did and afterwards as well.
Mesozoic
It really wasn't an era. An Era was a much longer period of time. It was called the "Jurassic Period".
The Mesozoic Era is known as the Age of Reptiles.
The Paleozoic Era of geologic history occurred before the Mesozoic Era.