Any living organism relies on an external source of energyradiation from the Sun in the case of green plants, chemical energy in some form in the case of animalsto be able to grow and reproduce. The daily 15002000 Calories (68 MJ) recommended for a human adult are taken as a combination of oxygen and food molecules, the latter mostly carbohydrates and fats, of which glucose (C6H12O6) and stearin (C57H110O6) are convenient examples. The food molecules are oxidised to carbon dioxide and water in the mitochondria
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): what relies on an internal source of energy
Ah, so.. unanswerable

The early currency of the United States did not exhibit faces of presidents, as is the custom now; although today, by law, only the portrait of a deceased individual may appear on United States currency. In fact, the newly formed government was against having portraits of leaders on the currency, a practice compared to the policies of European monarchs. The currency as we know it today did not get the faces they currently have until after the early 20th century; before that "heads" side of coinage used profile faces and striding, seated, and standing figures from Greek and Roman mythology and composite Native Americans. The last coins to be converted to profiles of historic Americans were the dime (1946) and the Dollar (1971).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Having portraits of leaders on coins was compared to who's policies?
Ah, so.. European monarchs

Tibet (i/tbt/; Wylie: Bod, pronounced [p]; Chinese: ; pinyin: Xizang) is a region on the Tibetan Plateau in Asia. It is the traditional homeland of the Tibetan people as well as some other ethnic groups such as Monpa, Qiang and Lhoba peoples and is now also inhabited by considerable numbers of Han Chinese and Hui people. Tibet is the highest region on Earth, with an average elevation of 4,900 metres (16,000 ft). The highest elevation in Tibet is Mount Everest, earth's highest mountain rising 8,848 m (29,029 ft) above sea level.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Where is the Asian Plateau?
Ah, so..
unanswerable