All sounds for speech vibrate at different frequencies, which is how you differentiate speech sounds. vowels are relatively low in pitch, while consonants such as l, m, and n are in the middle range of pitches. many speech sounds such as s and f are high in pitch. how would speech understanding be affected by a person with moderate to severe high frequency sensorineural hearing loss?

Speech understanding would have an effect hugely particularly if the hearing loss is merely in one range. This would let the person to not pick up or hear some letters articulated and perhaps not be able to put them together. For instance, l, m, and n are central range pitches and s and f are high range pitches. 

sounds good to me mate!

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.