After his mother smiles, Jimmy's request for a snack is reinforced. But if his mother is not smiling, his subsequent request for a snack is not reinforced. By indicating that Jimmy's request for a snack will be reinforced, the mother's smile is a:

discriminative stimulus

Explanation:

Discriminative stimulus involves the ability to differentiate between one stimulus and similar stimulus and its is used both in classical conditioning and operant conditioning. It will strengthen a particular action and increase the chance that the action will take place when a particular stimulus is presented and not in case of similar stimulus. As per the question, Jimmy's mother's smile act as a discriminative stimulus.

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.