Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

A frog develops (a/an) lungs as it changes from a tadpole to an adult frog.
Which of the following structures does a frog develop as it changes from a tadpole to an adult frog?

The energy stored in the organic molecules of food ultimately comes from the sun.
The energy stored in the organic molecules of food ultimately comes from where?

A hill do concentric circles on a topographic map indicate.

What do concentric circles on a topographic map indicate?