Oxygen is attached to oxygen is attached to an iron atom located on the heme portion of hemoglobin an iron atom located on the globin portion of hemoglobin a calcium atom located on the globin portion of hemoglobin a calcium atom located on the heme portion of hemoglobin

An iron atom located on the heme portion of hemoglobin

Explanation:

Oxygen is attached to an iron atom located on the heme portion of hemoglobin.

Hemogoblin is a protein present in the red blood cells of several vertebrates. The main function of this protein is to transport oxygen through blood. The heme portion consists of an organic cyclic compound that contains 4 nitrogen atoms, which bond to an iron atom.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.