Some scientists believe that about 65 million years ago an asteroid,meteorite,or comet struck the earth causing mass extinctions.One line of evidence for this event is:

Question

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The presence of a stratum rich in iridium is a strong line of evidence for an extraterrestrial impact event, as iridium is rare on Earth but more common in space rocks such as asteroids, meteorites, and comets. This line of evidence supports the theory that a massive impact event caused mass extinctions around 65 million years ago. The other options (B, C, D) may provide additional evidence for this event, but they are not the best choice since they are either limited in scope or not generally accepted as evidence for this theory.

Some Scientists Believe That About 65 Million Years Ago an Asteroid,meteorite,or