What is a unique characteristic of the gastrointestinal (GI) system?
A) It contains multiple organs that work together.
B) It is lined with epithelial tissue.
C) It is the only system open to the external environment.
D) The GI tract is sterile and contains no bacteria.
C
Feedback:
The GI system is the only system that is open to the external environment. The definition of a system is multiple organs working together to perform a function or functions. Many systems are lined with epithelial tissue. The GI tract is not sterile and does contain bacteria.
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