Cellular respiration - Weight loss

Question text:

You have a friend that lost 15 lbs on a diet.  Where did the mass go?

Background information:

This is an open response version of a DQC question.  It assess whether students can keep track of matter, while traversing biological scales.

We use this question in introductory biology courses.

Question Instructions: 

We recommend that you administer these questions as homework and preface the question with these instructions for students:

"For the following question, please respond to the best of your knowledge and using only the information in the question and what you know. Please do not refer to any outside sources (textbooks, notes, internet, etc.). Any reasonable attempt to answer the question will be awarded full credit."

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This material is based upon work supported by the National Science Foundation (DUE grants: 1438739, 1323162, 1347740, 0736952 and 1022653). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.