A newborn boy does not pass meconium in the first 24 hours. His abdomen is distended, and he begins vomiting. Various other tests lead to a diagnosis of Hirschsprung's disease. An obstruction is most likely to be found in which portion of the gut? A. Ascending colon
B. Ileocecal sphincter
C. Lower esophageal sphincter
D. Pylorus
E. Sigmoid colon

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the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

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