Identify what the formation of all macromolecules from their specific monomers have in common

The formation of all macromolecules from their specific monomers involve hydrolysis process (i.e. involve the removal of a water molecule).
This water molecule is removed as H from one of the molecules and OH from the other. Hydrolysis process is done in each condensation (connection)

Example:
X + Y ---> X-Y + HOH 
X-Y + Z ---> X-Y-Z + HOH 
etc . . . .

Answer (b) supersaturation;