Coal deposits of Illinios, the Appalachians, Britain and Germany were originally formed in a continuous band which was dispersed when the continents drifted apart. The Mesozoic Era lasted from 245 until 65 million years ago. In the sea, marine communities began to assume a modern composition of molluscs and other invertebrates. On land, dinosaurs dominated faunas, and the first flowering plants appeared. At the beginning of the Mesozoic, all of the earth's continents were joined as the supercontinent Pangea.
Some dinosaurs can swim and some can fly.
The ones that swim have large, flat arms, or flippers, that help them through the water. There are many theories about how the dinosaurs died. The most populaur one is that the weather became cooler, and the dinosaurs had no feathers or fur to protect them against the changing weather. Others are like a star exploded, but then how could some other speacies have lived. Another one is that an astioriod hit the earth and made the land dark for three, or so , years.