We are doing a chapter on color. Q. A red crab very deep in water, where sunlight is dim, appears: Orange? Cyan? Brown? Red? Black? I have seen crabs, reddish crabs, in shallow water, and they looked tan or brown. But in deep water, I am unsure they would be brown. I know this has something to do with the color red getting absorbed as you travel down in seawater. However, the book is saying that the real color of seawater is greenish-blue, and I feel it is more a tea color, more greenish tan. So, I don't know. Q. A blue crab will appear black when illluminated with: Blue light? Yellow light? Light? Cyan light? None of these? I think it's yellow...that's the complementary color of blue...but then again, doesn't that mean it would be white? So I would think it would be RED, perhaps, but that isn't a choice offered. Thanks for any help.