The Mesozoic Era is marked by dramatic evolutionary activity. What factor best set the stage for the dramatic development of insect, animal, and plant life in the Mesozoic Era?

The era is characterized by having one of the most diverse environment that the earth could have ever seen, as there were number of species of dinosaurs and there were different plant life as well, and the climate was not so cold to live for the different organisms.As, the life on earth flourish even there were organisms found on large scale inside the arctic circle.While, the level of CO₂ increased inside the Mesozoic era. Along , with which the extinction of about 96 percent of life made it very difficult for the rest of the organisms to survive and thus there were now mutations happening inside the different organisms genome.Along, with that the way of reproduction was greatly changed inside the plants, as more effective form of flowering plants were evolved. As, for the animals new species with the increase level of survival instinct were evolved from old simple ones across the globe.                        

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons