What is the name of the bony covering over the gills of ray-finned fishes?

More Questions:

What did American Harland David Sanders give to the world in the 1930s?

What does the word Karaoke literally translate to?

Who took Oliver Twist into his home even though he had been accused of picking his pockets?

When did author J. D. Salinger die?

What does Mount Snowdon roughly translate to from Old English?

What did the letters in USSR stand for?

How many daily tides are there if they are diurnal?

Which joint type can be found inside the human skull?

What birds are traditionally used as gas detectors in coal mines?

Who played the role of Jenna Maroney on the TV show "30 Rock"?

In what decade was Prince Charles born?

In which decade was the word "Internet" coined?

Who was the first European explorer to cross the Arctic Circle?

What was the nationality of Franz Liszt?

Which US Holiday is celebrated on October 12th?