Biology
The animals in which the body cavity is absent are known as ________ .

Coelomates
Pseudocoelomates
Wild
Acoelomates

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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 have valves; arteries do not
Veins are more muscular than arteries

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