Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago.
The end of the Cretaceous is a mass extinction.
Determine if the claim is supported, refuted, or if there is not enough information based on the evidence.

Claim: Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago.

Evidence: The end of the Cretaceous is a mass extinction.

Options: 

 - supported

 - refuted

 - not enough information
supported
Determine if the claim is supported, refuted, or if there is not enough information based on the evidence.

Claim: Cretaceous. The Cretaceous ended with a large mass extinction, the Cretaceous - Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous - Paleogene boundary (K - Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras. The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago.

Evidence: The end of the Cretaceous is a mass extinction.

Options: 

 - supported

 - refuted

 - not enough information
user
supported
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