Choose the statement that correctly characterizes the GI tract.
A. Body tissues are composed of substrates similar to food; thus, they would be degraded by enzymes in the GI tract if exposed to the internal environment of the GI tract.
B. The harsh environment in the GI tract allows for the absorption of indigestible materials without harming body tissues.
C. The two openings of the GI tract permit two-way transport of food, which maximizes absorption.
D. All of the choices are correct.
Answer: A
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