“…Many kinds of theories and hypotheses have been proposed, but no consensus has yet been reached, especially with respect to the causes of the body-mass scaling of metabolic rate (see e.g., [ 8 , 9 , 10 , 13 , 14 , 15 , 17 , 18 , 20 ]). Of these causes, growing interest has been shown regarding how various components of body size in multicellular organisms, such as cell size [ 9 , 14 , 18 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ] and organ size [ 9 , 14 , 17 , 18 , 20 , 34 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], may influence variation in metabolic rate and its scaling with body mass. Since cells are where metabolism happens, it seems natural to explore how the properties of cells may affect metabolism at the tissue, organ, and whole-body levels.…”