Biology
It is formed by a repeating nucleosome units ,which are closely attached to each other to a continuous fibre.

Chromatin
Chromosome
Centromere
DNA

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Biology
Which of the following is true about veins?

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

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