How many items make up a gross?

The "3 by 5" initiative aimed to provide antiretroviral therapy to 3 million people with which disease by 2005? In the 1971 sequel "Escape from" where, three chimpanzees travel back in time to 20th-century Earth? Three days after her death in 1991, which actress, a former wife of George C. Scott, won an Emmy for playing Murphy Bro… Three days before it was sunk by the British navy in May 1941, which German battleship sank HMS Hood? What is the name of a three-dimensional figure with 8 plane faces? Rhythmic, artistic and trampoline are three Olympic disciplines of which sport? Three Georgians have served as Speaker of the House: two Democrats and, from 1995 to 1999, which Republican? Sensory, motor and mixed are the three kinds of what body structures?