Biology
It is a the process which converts a single celled zygote into a great number of cells,which then differentiate into tissues.

Fractionation
Regenration
Meiosis
Mitosis

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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 valves; arteries do not
Veins have a smaller diameter lumen than arteries

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