True: Dromaeosauridae is one of the closest related dinosaur groups to birds., Oxygen levels were likely significantly lower than today during the majority of the Mesozoic., Crocodiles and Birds are more closely related than Crocodiles and most other reptiles., Most dinosaurs likely had feathers of some kind., Categorical systems of animals become arbitrary as you approach the common ancestor of different species., False: T-rex lived during the entirety of the Mesozoic., Sauropods were mostly aquatic animals that could not walk on land for long periods of time., The earliest ancestors of mammals did not appear until the Jurassic., All dinosaurs were killed off during the End-Cretaceous extinction event., What distinguishes mammals from other groups is giving birth to live young.,

Ancient Fauna

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