Eleanor wants to use classical conditioning to teach her students to run to the closet when the "intruder alert" sounds at their school. to be successful, eleanor must begin the learning process with a(n

The answer that fits the blank above is CS or Conditioned Stimulus. Classical Conditioning was introduced by a Russian psychologist, Ivan Pavlov. In classical conditioning, there are four steps to be followed and the first one is establishing the conditioned stimulus. Based on the scenario above, the conditioned stimulus would be the sound of the "intruder alert" and this is presented several times until it becomes conditioned.

Ithink it's a, but i might be wrong

Afine-grained igneous rock forms as a result of slow cooling.