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:
1 The Mesozoic Era is known as the Age of Reptiles. However, other life forms were also abundant. The oceans were full of marine organisms. Land animals competed for space and food. The food chain had begun. 2 Phytoplankton were at the base of the food chain.