The liver is a tubular organ.()
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Metaplasia epithelium distributed in()
A. ureter
B. trachea
C. intestines
D. bladder
The esophagus is a substantial organ.()
The following organs are substantial organs()
A. liver
B. lungs
C. ovary
D. spleen
The basic unit of organism structure and function is()
A. cell
B. tissue
C. organ
D. system