原题
The reaction of plants and animals to sunlight and seasonal changes, known as photoperiodism or seasonality, is vital to many biological and behavioral processes. Photoperiods, toge with tempe changes, imp seasonal migr, mating rit , and hiber. In ma birds, hor levels incr in spr, which leads to an increase in singing frequency in males and mating behaviors. Photoperiodism allows plants and animals to respond to changes in the environment associated with changing seasons and varying day length.
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解题思路
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