duchenne muscular dystrophy is caused by a sex-linked recessive allele. its victims are almost invariably boys, who usually die before the age of 20. why is this disorder almost never seen in girls?

Which of the following statements regarding gastrointestinal problems and/or treatments is true? a. gi inflammation is a rare disease that can occur after ingesting food toxins or sustaining injury. b. steroids, aspirin, and motrin don't irritate the stomach. c. antibiotics aren't used to treat gastrointestinal problems. d. bacteria such as h. pylori can induce gastric or stomach ulcers.