Biology
A genus can best be defined as

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

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Biology
Which of the following is true about veins?

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

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Biology
Normal adult human male has

10 gram of haemoglobin/100 gram of blood
14 gram of haemoglobin/100 gram of blood
24 gram of haemoglobin/100 gram of blood
18 gram of haemoglobin/100 gram of blood

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