Visible light runs through blue to green to yellow to orange to red. Red light is the least energetic and close to infrared and radio on the spectrum. Blue is the most energetic, close to UV light. They are a kind of fungi. There are over 100,000 of different kinds of fungi in the world.
Some fungi are parasitic.
They can destroy entire crops of plants like wheat and corn. There are scientists that study fungi called mycologists. Fungi are high in protein and Vitamin B. Yeast is known for mostly one thing. It is responsible for making bread rise and producing alcohol in beer and wine. Yeast is said to have first been noticed when an Egyptian bread maker was making bread for the king.