Is a bone disorder characterized by too little bone mass. Phosphorus
Like no one knows that whatever
Answer:Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 740 nanometers. In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz.
Explanation:
I think it is 2 not sure tho :)
The color would be yellow. For example, there is a yellow zone and curb at the hospital for you to pick up and drop off