Dinosaurs were a diverse group of reptiles that existed during the Mesozoic Era. They were of various sizes, ranging from the size of a chicken to the size of a building. The smallest known dinosaur was a species of bird-like dinosaur called Microraptor, which measured only about 1 foot tall and weighed just over a pound. On the other hand, the largest dinosaur known to have existed is the Argentinosaurus, which measured over 100 feet long and weighed approximately 100 tons. The size of each dinosaur varied depending on their species and the environment in which they lived.
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