The cell morphology of animal body is()
A. columnar
B. circular
C. fusiform
D. star
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The liver is a tubular organ.()
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