What is an energy human eyes can detect? A. light
B. mechanical
C. chemical
D. nuclear

A. light

Explanation:

I know because with longer wavelengths than visible light, has been "invisible" to the human eye.

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.