Answer:
To learn the lines of the bass clef, the awkward mnemonic “Good Boys Do Fine Always” is typically used, with the first letter of each word indicating the notes on that line (bottom to top: G, B, D, F, A). For the spaces, the mnemonic “All Cows Eat Grass” is used.
Explanation:
B) herman von helmholtz
The trichromatic color theory<span> began in the 18th century, when </span>Thomas Young<span> proposed that color vision was a result of three different </span>photoreceptor cells<span>. </span>Hermann von Helmholtz<span> later expanded on Young's ideas using color-matching experiments which showed that people with normal vision needed three wavelengths to create the normal range of colors. Physiological evidence for trichromatic theory was later given by </span>Gunnar Svaetichin<span> (1956).</span>
I really don't know the answer, I just don't know what language you're using, I'm so sorry