Problem:In aerobic organisms the energy needed to fuel biological functions is produced in the mitochondria via the electron transport chain. In addition to energy, reactive oxygen species (ROS) with the potential to cause cellular damage are produced. ROS can damage lipid, DNA, RNA, and proteins, which, in theory, contributes to the physiology of aging.

Answer this question based on the passage: where are reactive oxygen species produced in the body?
Solution:OK... To answer the above question, the relevant sentence is: In addition to energy, reactive oxygen species (ROS) with the potential to cause cellular damage are produced.
in the mitochondria.

Problem:Context: Bring It On: The Musical is a musical with music by Tom Kitt and Lin-Manuel Miranda, lyrics by Amanda Green and Miranda, and a book by Jeff Whitty. The musical is loosely based on the 2000 film of the same name and focuses on the competitive world of cheerleading and over-the-top team rivalries.

Question: who wrote the music for bring it on the musical?
Solution:OK... To answer this question, we should know that: Bring It On: The Musical is a musical with music by Tom Kitt and Lin-Manuel Miranda, lyrics by Amanda Green and Miranda, and a book by Jeff Whitty.
Tom Kitt and Lin - Manuel Miranda.

Problem:Salman bin Abdulaziz Al Saud (Arabic: سلمان بن عبد العزیز آل سعود ‎ Salmān ibn' Abd al -' Azīz Āl Sa'ūd Arabic pronunciation: ( sæɫmæːn ibˈn ʕabˈduɫ ʕaziːz æːɫ saʕuːd); born 31 December 1935 ) is a Saudi Arabian politician and royal statesman who has been King of Saudi Arabia, Prime Minister, Custodian of the Two Holy Mosques and head of the House of Saud since 2015.

Answer this question based on the passage: who is the current leader of saudi arabia?
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
OK... The relevant information is: Salman bin Abdulaziz Al Saud (Arabic: سلمان بن عبد العزیز آل سعود ‎ Salmān ibn' Abd al -' Azīz Āl Sa'ūd Arabic pronunciation: ( sæɫmæːn ibˈn ʕabˈduɫ ʕaziːz æːɫ saʕuːd); born 31 December 1935 ) is a Saudi Arabian politician and royal statesman who has been King of Saudi Arabia, Prime Minister, Custodian of the Two Holy Mosques and head of the House of Saud since 2015.
Salman bin Abdulaziz Al Saud.