________ is a major component of hemoglobin that carries oxygen to all parts of the body.
A. copper
B. magnesium
C. potassium
D. iron
Select your answer:
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Limitation of Senses › View Choose the correct statement about astigmatism.
A. Astigmatism can be corrected using bifocal lense.
B. Seeing part of an object clearer than the rest of the object
C. This defect is caused by the uneven curvature of the retina or eye lens.
D. Objects appear blurry because the image is focused in front of the retina.
Body System Interactions › View
Why is the maintenance of homeostasis important to multicellular organisms?
A. They must keep their internal environment within a narrow range of conditions.
B. They require the ability to adjust their internal environment to match their external environment
C. Their cells need to be able to respond rapidly to drastic changes in their external enviornment
D. Their internal environment must provide their cells with a wide range of conditions