Question

The strongest evidence that a meteor impact is responsible for dinosaurs becoming extinct is provided by:

A) the detection of high levels of radioactivity in the fossilized remains of dinosaurs from the time period corresponding to the extinction.
B) the presence of significant levels of iridium in the rock layers corresponding to the time of dinosaur extinction.
C) contamination of fossils from that time period with fragments of rock that penetrated the skeletons of many dinosaurs.
D) high levels of particulate matter in the lungs of dinosaur specimens perfectly preserved in ice.
E) None of the evidence presented supports a meteor impact being responsible for the extinction of the dinosaurs

Answer 1

B) The presence of significant levels of iridium in the rock layers corresponding to the time of dinosaur extinction.