Jurassic was the second era of the Mesozoic era, when dinosaurs became the ruler of land, pterosaurs and birds appeared, and mammals began to develop. Terrestrial gymnosperms have developed to their peak. The bivalves of freshwater invertebrates, gastropods, lobe limb , aphrodisiac and insects develop rapidly. The ammonite , bivalves, and arrow stones are still important members, and the changes in the six-shot coral from the Triassic to the Jurassic are very small. The sea urchins of echinoderm have occupied an important position since the Jurassic. Among the Jurassic plant communities, cycads, cypresses and ginkgoes in gymnosperms. Extremely prosperous. Among the ferns, ferns, real ferns and dense pine, cypress, ginkgo and tree ottos form a lush forest, while herbs and other grasses are all over the lower places, covering the ground. In relatively dry areas, cycads and goat teeth grow, forming a vast evergreen field. The Jurassic insects are more diverse, with more than a thousand species of insects living in forests and near lakes and swamps. In addition to the existing cockroaches, dragonflies, and beetles, there are also grubs, tree lice, flies and borers. Herbivorous vertebrates include prototheca and dinosaurs, as well as small reptiles similar to mammals. But in the late stage, the huge sauropod dinosaur had the advantage. These animals can eat plants at both high and low levels at the same time; dragon pods mainly rely on the stones they swallow to grind food. Large theories prey on herbivorous animals; while small theories, such as colosaurs and phthalodons, hunt small prey and may also feed on carrion. Pterodes with cortical wings are dominant creatures in the air. Early birds also appeared, most famously the Archaeoptera , which has bones, teeth and claws similar to small theories, but also feathered wings and tails, and can fly. Aerial organisms and ground organisms will also evolve. The animals in the sea also have a group of sea crocodiles and bony fish whose limbs have evolved into fin-shaped limbs. Other marine creatures include plesiosaurs and shortsaurus. The Jurassic was the heyday of dinosaurs. Dinosaurs that appeared and began to develop in , Triassic have quickly become rulers of the earth. All kinds of dinosaurs gather together to form a world of dragons in various shapes.
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