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A questionnaire that collects information that is valid is said to be:
Blood Plasma
The liquid component of blood that carries blood cells and other substances throughout the body, constituting about 55% of blood's volume.
Phlebitis
Inflammation of a vein.
Thrombophlebitis
Inflammation of a vein associated with the formation of a blood clot.
Varicosities
Abnormally enlarged, twisted veins that typically appear in the legs, caused by weakened valves and veins that struggle to return blood to the heart.
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