P3H4O1T1O1P3E1R1I1O1D2S1
20 points
PHOTOPERIODS is validvalid
PHOTOPERIOD, [n]
PHOTOPERIOD, the period during every 24 hours when an organism is exposed to daylight [n]
PHOTOPERIOD, [n]
PHOTOPERIOD, the period during every 24 hours when an organism is exposed to daylight [n]