Multiple choice __________ bacteria lives in the lower intestine endotherms. Brucella Brucella canis Brucella melitensis Escherichia coli Reveal answer Fill a bubble to check yourself D Correct answer Explanation Escherichia coli is a Gram-negative rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms (endotherms). Most E. coli strains are harmless.