Spiders are "blue bloods" because their __________ proteins contain copper instead of iron.

Name: Spiders are "blue bloods" because their __________ proteins contain copper instead of iron.
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Spiders have blue blood because their oxygen-binding proteins, known as hemocyanins, contain copper. In contrast, the oxygen-binding proteins in humans and many other animals, called hemoglobins, contain iron, which gives their blood a red color.

Spiders Are "Blue Bloods" Because Their __________ Proteins Contain Copper