The over 180 million yearshttp://www.enchantedlearning.com/subjects/dinosaurs/mesozoic/
Dinosaurs lived during the Mesozoic era
Earth was very different from then and now http://www.enchantedlearning.com/subjects/dinosaurs/mesozoic/
It is broken down into 3 time periods
They are Jurassic, Triassic, Cretaceous
Most animals became extinct during the Mesozoic erahttp://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/mesozoic-era
Reptiles were in the Mesozoic era
Credits:
Created with images by edenpictures - "Mesozoic Era" • Grand Canyon NPS - "Grand Canyon National Park- Fossils in Kaibab Limestone_0370" • Dimitry B - "Sunrise, Mount Huang, China" • BioDivLibrary - "n90_w1150"