Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart.
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in controlled experiment an independent variable is systematically manupulated and dependent variable is measured ; any extraneous variables are controlled
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what exactly do you want explained? I'd love to help! but I'm a bit confused :/ could you clarify?
In 2000, 25.7% of US men and 21.0% of women were smokers.
D) Coping with difficult situations