The bar charts show the quantity of endothelial tissue, elastic tissue and muscle tissue in the walls of three blood vessels, P, Q and R.
Which row correctly identifies the three blood vessels?

P) elastic artery Q) muscular artery R) vein
2 )
P) vein Q) elastic artery R) muscular artery
3 )
P) muscular artery Q) elastic artery R) vein
4 )
P) elastic artery Q) vein R) muscular artery
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