Question

parts of the electromagnetic spectrum that humans can not see are called ______.a. darkb. magicalc. invisibled. visible

Explanation:

The electromagnetic spectrum has a range of wavelengths; only a small segment is detectable by human eyes (called visible light). The rest of the spectrum, which humans cannot see, is referred to as invisible. "Dark" is not a scientific term for this, "magical" is not a valid scientific category, and "visible" describes the part humans can see.

Answer:

C. invisible