Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound?

The empirical formula represents the simplest whole number shows the simplest whole number ratio of atoms in a compound.  An example of this is the empirical formula for glucose (C₆H₁₂O₆) is C₃H₆O₃.  

I hope this helps.  Let me know if anything is unclear.

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).

The correct answer is b) false