Answer:
<h2>The Tri-Chromtic theory</h2>
Explanation:
The Tri-chromatic theory is based on the assumption that the three classes of cone receptors sub serve the colour vision. This theory dates back to 18th century and was popular during the first half of 20th century and was often used against the opponent processes theory. It was also known as Young-Helmholtz theory of colour vision, according to this theory there are three receptors in the retina that are responsible for the perception of colour. These receptors have different sensitivity level. Blues ones are the most sensitive and the red ones the least. But to perceive the colour needs the interaction between at least two photo receptors. Then the three colours are combined to form any colour in the visible spectrum.
They acquired the Panama Canal Zone
A demanding or threatening event is often called a "stressor".
Stressors are occasions and circumstances that happen to individuals. A few cases of stressors include: Real life changes. These progressions can be positive, for example, new marriage, an arranged pregnancy, promotion in your job or new house. Or then again they can be negative, for example, the passing of a friend or family member or a separation.
The answer is D because Boris Yeltsin was, like, so over communism and all the stuff that goes with it and Mikhail Gorbachev was like, his friend cuz they agreed on stuff like the falling of the Soviet Union.
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