When I got my kids cell phones, it was at age 11. That was the age at which they started doing things without their parents around, including taking a bus by themselves. I told them they could have the phones when they turn 12, but I gave them phones at the beginning of the school year during which they would turn 12.
The Paleozoic Era. The Paleozoic Era, meaning ancient life is the first of three eras that form a part of the Phanerozoic Eon, the other two periods being the Mesozoic and the Cenozoic. The Mesozoic is the age of the Dinosaurs and the Cenozoic is the era in which we now live. The Paleozoic Era spanned a longer period of time, from approximately 542 Ma to 251 Ma. Just as the Mesozoic is divided into periods (Triassic, Jurassic, and Cretaceous), the Paleozoic Era is also divided. It contains six different periods which are:
the mesozoic era the mesozoic era is the age of the dinosaurs and lasted almost 180 million years from approximately 250 to 65 million years ago this era includes 3 well known periods called the triassic jurassic and cretaceous periods a mass extinction marked the beginning and end of the mesozoic era