Biology
The principle of dominance states that

All alleles are recessive
Alleles are neither dominant nor recessive
All alleles are dominant
Some alleles are dominant, while others are recessive

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Biology
Which of the following is true about veins?

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

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