The part of the gastrointestinal tract with the largest natural microbiota is the _________.

When plaque becomes heavy and hardened, it is called dental calculus or _________.

Antibiotic associated pseudomembranous colitis is caused by _________.

Jaundice results from a buildup of _________.

Chronic _________ infections cause the unique sign of disease of greasy stool and are often resistant to treatment.

Liver flukes are often found in the _________ duct.