Select your answer:

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Circulatory & Respiratory › ViewHow is carbon dioxide transported in the blood?
A. Dissolved in Plasma
B. Bound to Platelets
C. Hemoglobin in Red Blood Cells
D. Hemoglobin in White Blood Cells
Pollution › View
Worldwide, temperatures have been increasing for more than 100 years. Is this evidence of global warming?
A. yes
B. no