How does the K Pg boundary prove the asteroid theory of extinction?

In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary, which can be found throughout the world in marine and terrestrial rocks.

Explanation:

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

answer; i believe the correct answer to the above question is ( friction)