No dinosaurs lived in the sea. There were other reptiles that adopted a marine life, but those weren't dinosaurs.
When the dinosaurs lived there were sea monsters but they were called marine reptiles and were not dinosaurs.
A marine mammal is an animal that lives in the ocean and breathes air, like whales, dolphins, seals, and manatees. These animals have adapted to life in the water and often have special characteristics to help them survive in the marine environment.
Plesiosaurs were not dinosaurs. They were a clade of marine reptiles that lived at the same time as the dinosaurs.
Although some dinosaurs were probably able to swim there were no true marine dinosaurs. There were marine reptiles that some colloquially refer to as dinosaurs, but these were actually a separate group called plesiosaurs. Another group that lived in the age of the dinosaurs were the flying reptiles pterosaurs. These are also incorrectly referred to as dinosaurs by many, but they were themselves a separate but closely related group. However, fossil evidence shows that birds are descended from small carnivorous dinosaurs and can in fact be classified as modern dinosaurs.
The structures that make the perch adapted for living in water are the gills, fins, and streamline-shaped body. All designed to survive in different waters (marine and fresh water).
There were no ocean dwelling dinosaurs. Large marine reptiles that are often thought of as dinosaurs include plesiosaurs, pliosaurs, mosasaurs, and icthyosaurs.
Dinosaurs never lived underwater. There were marine reptiles that are sometimes inaccurately called dinosaurs; these include icthyosaurs, mosasaurs, plesiosaurs, and pliosaurs. All of these are extinct. There are a few marine reptiles alive today, though. These are sea turtles, sea snakes, and the semi-aquatic marine iguana.
Elasmosaurus was a giant plesiosaur, which were a group of marine reptiles. However, nono of these marine reptiles were dinosaurs.
The amount of sunlight in the marine biome varies depending on the depth of the water. In shallow waters, sunlight can penetrate and support photosynthesis for marine plants and algae. In deeper waters, sunlight is limited and organisms have adapted to survive in low light conditions or with alternative energy sources like chemosynthesis.
They include Ankylosaurs (the armored dinosaurs), Mosasaurs, and Plesiosaurs (both marine reptilian groups).
True or false