Discussion
Life cycle of Musca domestica in winter season is :
Answer: D
The key gives 22 days.
The house fly, Musca domestica, passes through egg, larva, pupa and adult, and the length of the cycle depends strongly on temperature: it is a week or so in hot weather and much longer in the cold. That is why the question asks about the winter season, and why the shortest options of 5 and 10 days, which belong to warm conditions, do not suit it.
I could not find a source that states 22 days for the winter cycle, or one that gives another figure for it, so the choice between 15 and 22 days rests on the University's key. A longer winter cycle fits what is known about temperature and development.
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