Aside from sight in which we utilized to see our surroundings, it is also used in some electronic equipment which are useful for us human. The light produced from television, the fluorescent light, the light of motor vehicle, the image we view from the screen our cellphones and computer.
Visible light is composed of constituent colors: the red, orange, yellow, green, blue, indigo and violet. These colors do not distinctly separate but they continuously change from red to violet. Red color has the longest wavelength from among these colors and violet has the shortest. It is the only electromagnetic wave where its wavelength is sensitive to our eyes which means our eyes can detect the visible spectrum.
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maybe it's letter b?
it's not poisonous so it's not letter b.
also those are nit metals
as far as i remember, metalloids is composed or. combined by metal and the other one (just forgot)
so i thinj it's letter b.
for iron nail is electricity
and charcoal is an wood, fuel, and