Are dinosaurs extinct? Theropod dinosaurs are the bipedal (\"two-footed\") carni

Question

Are dinosaurs extinct?

Theropod dinosaurs are the bipedal ("two-footed") carnivores of Tyrannosaurus rex fame that many people imagine when they think of dinosaurssharp teeth, claws, long tails, and a taste for flesh. Did these dinosaurs go extinct?

Interpret the tree in the figure below.

Part A

Archaeopteryx is more closely related to Aurornis than to true birds.

part B

True birds are more closely related to Enantiornithes than to Confuciusornis.

Part C

Archaeopteryx is an ancestor of true birds.

Part D

Tyrannosaurus rex (Tyrannosauroidea) is an ancestor of true birds.

Source: Godefroit, P., A. Cau, H. Dong-Yu, et al. 2013. Nature 498: 359362. Tyrannosauroidea Oviraptorosauria Dromaeosauridae Troodontidea Aurornis Archaeopteryx Rahonavis Shenzouraptor Balaur Confuciusomis Euornithes (true birds") Enantiornithes 180 160 140 120 100 80 60 40 Million years ago

Explanation / Answer

Archaeopteryx is more closely related to Aurornis than to true birds. False

True birds are more closely related to Enantiornithes than to Confuciusornis: True

Archaeopteryx is an ancestor of true birds: False

Tyrannosaurus rex (Tyrannosauroidea) is an ancestor of true birds: False

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