Red or the color red is the color of the frequency in the most low-light visible or can be captured on the human eye. Red light has a wavelength range of approximately 630-760 nm. The blood was given oxygen to red due to the presence of hemoglobin. The red light is the first light that is absorbed by the seawater, so many fish and marine invertebrates that it looks red saga (bright red) becomes visible in their natural habitat.
