Final answer:
Lymphatic vessels are similar to veins in structure, but they carry lymph instead of blood and have unique characteristics such as valves.
Explanation:
Lymphatic vessels are similar in structure to veins, both having a three-tunic structure and valves. They carry lymph, not blood, and have a system of tubes with valves that return the lymph to the bloodstream. Unlike veins, lymphatic vessels are more uniform in size and have thinner walls.
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