Biology
Which of the following is true about veins?

Veins are more muscular than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have a smaller diameter lumen than arteries
Veins have valves; arteries do not

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Biology
The main function of the inner bark of a woody plant is to

Act as a membrane impermeable to water and gas
Transport minerals and water from the roots to the leaves
Transport food from the leaves to the other parts of the plant
Protect the plant from herbivorous animals

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