Biology
Virus is not regarded as a cell,because

The genetic material does not replicate on its own
It is anactive unless it finds a host to multiply
Most of the cellular activity is absent
All of these

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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
Which statement best describes Arteries?

They have thin walls and transport blood away from the heart
They have thin walls and transport blood toward the heart
They have thick walls and transport blood away from the heart
They have thick walls and transport blood toward the heart

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