According to the opponent-process theory, cells that are stimulated by exposure to light are inhibited by exposure to light. yellow; blue red; blue blue; green yellow; green blue; red

YELLOW; BLUE

Explanation:

OPPONENT PROCESS THEORY OF COLOR

This theory suggests that we are able to perceive colour through 3 receptor complexes who oppose each other being the red-green complex, the blue-yellow complex, and the black-white complex.

According to this theory, there are cells that can only detect the presence of one color in the complex at a time because the two colors oppose one another. For example, humans cannot see a greenish red because the opponent cells can only detect one at a time.

Interesting theory but let me not digress. The blue-yellow complex oppose each other and so the first option is correct.

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.