Biology
Which of the following is true about veins?

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

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Biology
Plants are killed in winter by frost

because there is no transpiration
because of desiccation and mechanical damage to the tissues
because respiration ceases at such low temperature
because no photosynthesis takes place at such low temperature

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