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 . . . .

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.