Raccoons were housed throughout the study such that they were constantly exposed to a natural cycle of temperature and photoperiod. [Please select]
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These captives had been kept for several months at a temperature of 21 degrees Centigrade, and on a daily photoperiod of 15 hours. [Please select]
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Some captive males had enlarged, scrotal testes in January; the extended photoperiod and warm temperature probably influenced the breeding condition. [Please select]
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The mice were kept in a room in which temperature and photoperiod were controlled. [Please select]
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