No one knows how long it lives for
i think that the plesiosaurs lived in a big ocean
Yes, the noun 'plesiosaurs' is a common noun, a general word for a type of extinct, marine reptile; a word for any plesiosaurs.
They include Ankylosaurs (the armored dinosaurs), Mosasaurs, and Plesiosaurs (both marine reptilian groups).
Yes it was.
No, plesiosaurs looked like fish but were reptilian. They had to breathe air and fossil evidence shows they gave birth to live young.
There were two main kinds of plesiosaurs. The most famous, the long necked plesiosaurs, ate fish and other small marine animals. Lesser known are the short necked plesiosaurs, which looked similar to gigantic crocodiles and ate larger marine animals.
It was herbivorous
No dinosaurs lived in water. The prehistoric reptiles that lived in water were the Plesiosaurs, not dinosaurs.
First off, plesiosaurs and pterodactyl were not dinosaurs. Plesiosaurs were their own group of reptiles more closely related to lizards than to dinosaurs. Pterodactyl was a pterosaur, which were a group separate from, but related to dinosaurs. Plesiosaurs are generally considered to have been discovered by Mary Anning. Pterosaurs are said to have been discovered by Cosmio Collini.
Animal life was then dominated, by large archosaurian reptiles: dinosaurs, pterosaurs, and aquatic reptiles such as ichthyosaurs, plesiosaurs, and mosasaurs. the first birds and placental mammals also appeared
During the time of plesiosaurs, which spanned from the Late Triassic to the end of the Cretaceous period, the Earth was dominated by dinosaurs and lush vegetation. The climate was generally warmer than today, with high sea levels that created extensive shallow marine environments. Plesiosaurs, with their distinctive long necks and broad bodies, thrived in these oceans, preying on fish and other marine life. The ecosystems were rich and diverse, with a variety of marine reptiles, ammonites, and early sharks coexisting alongside plesiosaurs.