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red blood cells

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The disk-shaped cells in the blood that contain hemoglobin. The red blood cells supply oxygen to all body cells and remove the carbon dioxide wastes that result from metabolism.

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Which of the following nouns has an irregular plural form?
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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