It is both a vascular and living organism.
The two ways are: Heterogeneous Homogeneous
Two ways are by temperature and brightness
elevation and shape
Public and Private
Fixed Bridges or Moveable Bridges
spectrum and temperature
See the link below for details about clouds classification.
How are elements classified
What are some ways the stars in the photo could be grouped or classified
The answer is Pollen and the Sugar cone.
Waves can be classified as mechanical or electromagnetic based on how they travel through a medium. They can also be classified as transverse or longitudinal based on the direction of oscillation compared to the direction of wave propagation.
They can be classed as terrestrial planets or gas giants, or inner and outer.