veins have which of the following characteristics?
A. they carry deoxygenated blood toward the heart
B. they carry oxygenated blood away from the heart
C. they are microscopic vessels that link arterioles and venules
D. they carry only red blood cells
Answer: A. they carry deoxygenated blood toward the heart
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.