Which question could be tested in a scientific manner? What causes some people to be color-blind? Why should people be nice to other people? Why is the color purple better than the color red? What are the best shoes to wear when exercising?
"What causes some people to be color-blind?" Seems like the best answer here. You Cant scientifically test "Why should people be nice to other people? Why is the color purple better than the color red?" that would be opinions and i feel "What are the best shoes to wear when exercising?" isn't the answer bc that would be opinion factored too bc some people have different likings and different shaped feet Hope This Helped ;)
so what do you thing the answer is
What Causes people to be color blind is the answer
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