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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Biology
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

You need an antiseptic, not an antibiotic
You are infected by a virus
Having waited a day, it is too late to take an antibiotic
You need to be vaccinated instead of taking an antibiotic

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