Muslims are expected to attend the annual Hajj, or pilgrimage to Makkah (Mecca), in Saudi Arabia...

According to https://www.britannica.com/topic/hajj

" Hajj, also spelled ḥadjdj or hadj, in Islam, the pilgrimage to the holy city of Mecca in Saudi Arabia, which every adult Muslim must make at least once in his or her lifetime. The hajj is the fifth of the fundamental Muslim practices and institutions known as the Five Pillars of Islam."

Explanation:

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answer; i believe that the correct answer is (decreased)

those sounds of the natural world are bioacoustics, and they're more than a false-color spectrogram of data from the musiamunat conservation area.