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>
Answer:
Student Schedule May 17 - May 21
Nikki Rhodes
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1. Who will win the election for Mayor in November? <u><em>C</em></u>
2. Tom Johnson used to be a police officer. <u><em>c</em></u>
3. He announced on monday that he wants to be mayor.<u><em> x</em></u>
4. My father said he would vote for Tom. <u><em>C</em></u>
5. Mom and my sister Judy haven’t decided yet. <u><em>C</em></u>
6. They will vote at our school. C
7. Every Fall and Spring they put up voting booths there. C
8. I hope the new mayor will do something about our river. C
9. That River is full of chemicals. C
10. i am glad our water doesn’t come from Raven River. X
11. In late Summer, the river actually stinks. C
12. Is every river in our State so dirty? C
13. Scientists check the water every so often.C
14. Some professors from the college even examined it.C
15. That is getting to be a very educated River!C but there's a spelling mistake in this one ;-; :)
