When a colectomy is performed, a segment of the stomach is resected and an anastomosis is performed between the remaining ends?

The above statement is False.
When a colectomy is performed, a segment of the stomach is not resected and an anastomosis is not performed between the remaining ends. Colectomy is a surgical procedure to remove part or the whole colon. Colon is a long tube-like organ at the end of the digestive tract; it may be necessary to treat or prevent diseases and conditions that affect the colon. The Colon resection can be performed in two ways; convectional open surgery or laparoscopic surgery. 

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When you are making a guess you are forming a hypothesis