Myoglobin, a protein that stores oxygen, has a mass of 2.98 * 10^14 ___.
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To determine the unit of measurement that completes the sentence, we need to understand the given information. The mass of myoglobin is provided as 2.98 * 10^14, but the unit of measurement is missing.
To determine the unit of measurement, we can refer to the International System of Units (SI). Mass is typically measured in grams (g) in the SI system. Therefore, we can assume that the missing unit in the sentence is grams (g). Therefore, the completed sentence would be:
"Myoglobin, a protein that stores oxygen, has a mass of 2.98 * 10^14 grams (g).