Which is a reasonable estimate for the height of a polar bear?

Which is a reasonable estimate for the length of a car key?

Which is a reasonable estimate for the length of a stick of gum?

Which is a reasonable estimate for the length of a belt?

Which is a reasonable estimate for the width of a computer keyboard?

Which is a reasonable estimate for the depth of sea?

Which is a reasonable estimate for the height of a mailbox?

Which is a reasonable estimate for distances traveled by car?

Which is a reasonable estimate for the length of an eraser?

Which is a reasonable estimate for the height of a antelope?