music: 50's Chart Toppers: Name The Artist: Jenny, Jenny?

Questions

A hard working adult sweats up to ______ gallons per day?

The average ice berg weighs ___________ tons?

The poison-arrow frog has enough poison to kill about _______ people?

A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a?

After eating, a _______ regurgitates its food and then eats it again?