particle and wave
No, they are two because they are two completely different things
At one time, all living things were classified into two kingdoms of plants and animals. Aristotle developed this first classification system.
Plants and animals.
Plants and animals (plantae and animalia)
Light
They are classified by the amount of Light they give off, and their temperature.
When a ray of light hits a surface, two things can happen: reflection, where the light bounces back off the surface, and refraction, where the light enters the material and changes direction.
we know that all object that we see can be classified into two types:luminous and non-luminous.
Light and warmth.
lightbulbs and the sun
Two things the Sun provides is heat and light.
ATP and NADPH .