[Answer] What color is spider blood?

Step 1 : Introduction to the question "What color is spider blood?"

...There's a myth that human blood that lacks oxygen is blue. That's not true, however. Human blood, whether it's carrying oxygen or not, has a red color because of the iron content of the red blood cell. The chemical hemoglobin binds the iron to the cell inside the blood vessel. In a spider, however, the blood is blue. Spiders don't have hemoglobin; they have hemocyanin floating freely in their blood. Hemocyanin doesn't have iron in it but contains copper instead. This is what gives the spider's blood a bluish color when it's oxygenated. Source: CompoundChem.com

Step 2 : Answer to the question "What color is spider blood?"

Blue:

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