Salivation in response to food being placed in the mouth and an eyeblink response to a puff of air, are both examples

The answer is they are both example of conditioned responses. The potent stimulus is one that does not require any learning or conditioning to respond to appropriately.  Must be learned by the individual by pairing a neutral stimulus with a potent stimulus is called a conditioned response is a manners that does not come naturally. 

answer; ///(b) it is composed of four protein chains and four heme groups;