3. scientists believe that the boundary stratum between the cretaceous and paleogene was
caused by an asteroid. what evidence is most consistent with this theory?
a. the stratum is found all over the world.
b. the stratum is thin.
c. the stratum contains iridium.
d. few fossils are found in the stratum.

C. The stratum contains iridium

Explanation:

The Asteroids are large rocky bodies found on the orbit of the sun.If a fragment of a asteroid falls on the earth it is known as the meteorite According to Luis and Walter Alvarez they stated that a huge asteroid strikes the gulf coast of mexico that killed many species o earth including the dinosaurs.this might be the reason for extinction of dinosaurs.Scientists and researchers reported that more than one asteroid involved in extinction of species of the earth.

not only is it colder, it also becomes darker, less salty, and more dense.