Biology
Organisms that feed on the excreta of other organisms are called

Saprotrophs
Coprophagous
Autotrophs
Heterotrophs

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Biology
Which of the following is true about veins?

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

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