The Latin verb supponere, meaning substitute, has several legitimate heirs in English, including supposititious (which dates from the early 17th century) and supposition (a 15th century addition).
Cellular respiration takes place in the organelles called mitochondria. The mitochondria take in glucose, a type of sugar, and change it in the presence of oxygen into an energy-rich molecule called ATP, or adenosine triphosphate. For every molecule of glucose, 36 molecules of ATP are made.
All cells from living organisms undergo cellular respiration. Respiration occurs in the mitochondria of  eukaryotic cells and in the cytoplasm of prokaryotic cells. A cell under goes two types of respiration 1st aerobic and 2nd anaerobic respiration. In 1st one cell need or cell use oxeygen, and 2nd one in which cell respire with out oxygen.