In pavlov’s experiments on classical conditioning, dogs

a. learned to associate food with salivation.
b. learned to ring a bell whenever they were hungry.
c. were conditioned to salivate in response to the sound of a bell.
d. were conditioned to salivate in response to food.

Paleontologists have found plant fossils deep within the layers of the north polar region. these leaf fossils have been labeled as to the rock layers they were found in, with the lower numbers being layers close to the earth's surface and higher numbers representing deeper layers. according to the numbers of these four leaf fossils, what might you infer?