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A sudden drop in temperature.
Sudden exertion in cold weather can strain a person's heart or cause accidental hypothermia if precautions are not taken.
C02
A sudden change in temperatures (eg. going from a very hot country to a very cold country) can have an effect, yes.
An unexpected change in an organisms trait is a mutation.
A sudden change in weather is caused by an air mass.
A sudden drop in the temperature
A sudden drop in the temperature
A sudden drop in temperature.
A sudden drop in temperature.
A sudden drop in temperature.
A sudden drop in temperature.
A sudden drop in the temperature
A sudden drop in temperature.
By rather sudden changes in wind paths and temperatures
a sudden drop in the temperature
Eclipse Of The Moon