A bat's wings are actually modified forms of which body parts?

What basic pair is called "pan y mantequilla" in Spanish? In a bakery, what word names a shaped mass of bread baked in one piece, such as a sourdough or rye? Which basic unit of mass is equal to about 2.2046 pounds? A basilica stands in which Portuguese village where the Virgin Mary was reported to have appeared in 1917? Which verb can describe what you do to a dead car battery, someone else's mining claim and an opponent's checkers piece? Which battery brand's pink, drum-beating bunny "keeps going and going and going"? Which word is shared by blues legend B.B., tennis star Billie Jean and Poland's Boleslaw I? A BBC review said that as Bert in "Mary Poppins", which actor spoke a form of Cockney "unknown within 5,000 miles of Bo…