Which is not one of the three embryonic layers?

Approximately how many FDA-approved non-prescription drugs are available on the U.S. market?

A) 700 B) 900 C) 1,000 D) 2,000

Knowing that muscular dystrophy affects the voluntary muscles, which one of the following patient problems should you expect to be a direct effect of the disease?

A) Constipation B) Slow heart rate C) Inability to walk D) Vasodilation