Mould is one of the oldest lifeforms on earth.  It grows and thrives off almost anything on the planet.

Found in all parts of the world, mould survives in freezing conditions and very hot conditions.

Mould travels on airborne dust, which are solid particles, ranging in size from less than 0.001 mm up to 0.01 mm.

The following diagram provides a simple representation of the life-cycle.