Refers to an extraneous variable attributable to changes in the test units themselves that occur with the passage of time.

Maturation.

Explanation:

According to my research, I can say that based on the information provided within the question the term being defined in this statement is called Maturation. This term is used in many categories to refer to the changes over time until full maturation is achieved, which is the peak point in value.

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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.

portugal is the westernmost country in europe.