Hemoglobin and hemocyanin A) are both used by vertebrates to transport O₂. B) both have iron-containing proteins. C) are blue when oxygen levels are low and red when oxygen levels are high. D) are found inside blood cells. E) both transport oxygen.

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Quizplus · Accepted Answer

Hemoglobin and hemocyanin both transport oxygen, but hemoglobin is found in vertebrates and contains iron, while hemocyanin is found in some invertebrates and contains copper.

Hemoglobin and Hemocyanin