Biology
Which one of the following phylum is characterised by absence of true coelom

Nematoda
Mollusca
Echinodermata
Annelida

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

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