Is a type of learning in which a neutral stimulus comes to elicit a response after being paired with a stimulus that would elicit the same response naturally.

I believe that classical conditioning is a type of learning in which a neutral stimulus comes to elicit a response after being paired with a stimulus that would elicit the same response naturally. It is where a conditioned stimulus becomes associated with an unrelated unconditioned stimulus in order to produce a behavioral response which is referred to as  a conditioned response. 

Compound light microscope

Where's the picture of the model?