Scientists Evaluating the Cretaceous Mass Extinction Have Concluded That

question 16

Multiple Choice

Scientists evaluating the Cretaceous mass extinction have concluded that

• A)only an extraterrestrial impact could have caused such a big extinction event.
• B)climate change would not have been involved in producing the extinctions.
• C)ecological factors such as disease and competition probably caused the dinosaurs to go extinct.
• D)the asteroid impact was probably the triggering event for the extinction.

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Definitions:

Stent

A tube or other device inserted into a blocked passageway to keep it open, frequently used in arteries to prevent or relieve a blockage.

Blockage

Blockage refers to the obstruction or closing off of a passage or vessel, impeding or stopping the flow within it.

Cardiovascular Disease

A general term for conditions affecting the heart and blood vessels, such as coronary artery disease, heart attacks, and stroke.

Hypertension

Form of cardiovascular disease characterized by blood pressure over 140/95 (over 45 years of age) or 130/90 (under 45 years of age).