The last major dinosaurs were wiped out as a consequence of a major impact with the Earth about 65 million years ago. All but one of the following statements would be regarded as evidence for this claim.
A)The fossil record shows a mass extinction event 65 million years ago, where only 25% of the species survived.
B)At least 150 craters from past impacts have been identified, including one of the right age and size in Mexico.
C)A layer of iridium in 65- million year old sediments in the Earth's crust
D)Multiple historical accounts describe a planetary- level flood and storm that wiped out most living things.

Question

Quizplus · Accepted Answer

The presence of a layer of iridium, a mass extinction event in the fossil record, and the identification of craters of the right age and size are all scientific evidence supporting the impact theory. Historical accounts, however, cannot be considered reliable evidence for events 65 million years ago, as human records do not extend that far back in time.

The Last Major Dinosaurs Were Wiped Out as a Consequence