It is important that researchers study motor development across the life span, especially into the later stages of an individual's life, because it is estimated that by the year 2030, of the population in the united states, china, russia, australia, and canada and the majority of the european union countries will be aged 65 years and older.

13%

Explanation:

According to my research on population studies, I can say that based on the information provided within the question it is calculated that by the year 2030 about 13% of the population of those countries will be aged 65 years and older. Studying motor development might help governments in making decisions and developing programs to help the elderly.

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answer; overt behavior;

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.