Biology
Which of the following are involved directly in pulmonary circulation?

Superior vena cava, right atrium, and left ventricle
Right ventricle, pulmonary artery, and left atrium
Left ventricle, aorta, and inferior vena cava
Right atrium, aorta, and left ventricle

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Biology
Plants are killed in winter by frost

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

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