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>
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the two other reason we should study musical elements is that studying music can have a significant impact on students and their ability to memorize, to increase creativity and their opportunity for collaboration.
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a computer. The advent of technology in all aspect of human life made life simple and easy.The fast processing and error checks makes writing in computer a unique to 20th century. The handwriting never significant here as one can take any font to inscribe the text and the standardization and uniqueness of each characters makes computer typing the best of all writing tools. The features available are enormous that one has different options available in writing in computers.
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