Biology
A genus can best be defined as

A taxon comprised of classes
A taxon composed of one or more species and a classification level lying below family
The most specific taxon
A taxon composed of families

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Biology
Which one among the following statements is correct ?

Except the pulmonary vein, all other veins carry oxygenated blood
Except the pulmonary artery, all other arteries carry oxygenated blood
All veins carry oxygenated blood
All arteries carry oxygenated blood

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