Final answer:
Visible light can be seen by some animals and by humans wearing special equipment. It is the portion of the electromagnetic spectrum that our eyes can perceive.
Step-by-step explanation:
Visible light can be seen by some animals and by humans wearing special equipment. This is because visible light is the portion of the electromagnetic spectrum that our eyes can perceive. The human eye has evolved to detect wavelengths between roughly 400 and 700 nm, which corresponds to the colors of the rainbow. Other species, like honeybees and some snakes, can detect light in other portions of the electromagnetic spectrum.