Biology
A genus can best be defined as

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

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Biology
Plants are killed in winter by frost

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

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