Warm-blooded dinosaurs emerged 180 million years ago earthsky.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from earthsky.org Daily Mail and Mail on Sunday newspapers.
Shark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and roughened by toothlike scales. The mouth contains sharp triangular teeth. Sharks lack a swim bladder and must swim to keep from sinking.
Sauropod, any member of the dinosaur subgroup Sauropoda, marked by large size, a long neck and tail, a four-legged stance, and a herbivorous diet. These reptiles were the largest of all dinosaurs and the largest land animals that ever lived. Sauropods shared a body plan consisting of: a small head on an extremely long neck; a long, massive body housing an enormous gut; thick pillarlike legs to support the torso; and a very long, tapering, often whiplike tail. A massive hip girdle was fused to the backbone, usually by five sacral vertebrae; this arrangement provided solid support for the body