In a microscopic field showing an artery and its corresponding vein, you can easily distinguish the two because

Answer;

-Veins have thinner walls and are irregular in shape

In a microscopic field showing an artery and its corresponding vein, you can easily distinguish the two because veins have thinner walls and are irregular in shape.

Explanation;

-The walls of the arteries are found to be thicker than that of a vein because the blood that is carried from the heart to the capillaries has more high pressure.

-To withstand the pressure of the blood coming out from the heart, arteries need thick walls. The returning blood in the veins is under low pressure. Because of the lower pressure, vein walls are thinner.

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i think the answer would be d