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Question: a very interesting comparison is that between a thermal engine...

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A very interesting comparison is that between a thermal engine and living systems, say us. Thermal engines operate under a temperature gradient, as a vapor locomotive, whereas we are essentially isothermal systems. Also, the second law of thermodynamics establishes that the entropy of the universe increases in any spontaneous process, eventually leading to equilibrium.
Discuss the following aspects in qualitative terms:
a. What is the source of useful work in biological systems?
b. How do we maintain steady state?
c. Are there biological processes that occur reducing entropy? If the answer is yes, how do we reconcile this fact with the second law of thermodynamics

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