Answer
21 kcal (2SFs)
Work Step by Step
(24 hr) (60 min/1 hr) (60s/1 min) = 86,400 sec
(86,400 sec) (2x10^6 ATP/1 s cell) (10^13 cells) (1 mol ATP/6.02 x 10^23 ATP)(7.3 kcal/1 mol ATP)
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