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Parenteral
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Concrete
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Mangrove swamp
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Anovulation
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Uterine relaxant
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Neutron star
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Spermophilus
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Expression
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Watt
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Mandrake
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Specialised link
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New Technology Telescope
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Syrian brown bear
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Toxoplasmosis
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Endoplasmic reticulum
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Interferometer
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Radial velocity
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Frequency band
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ADH
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Bennett's comet
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Buccal enanthem
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Trisomy 21
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Bait
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Cochlear implant
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Artificial CO2 sequestering
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Efflorescence
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Necrosis
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Irregular galaxy
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Wolf, Max
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HSR
Photoperiod
The photoperiod is the ratio between the length of the day and the length of the night. This ratio influences many physiological and ecological activities such as reproduction, migration, beginning of hibernation, flowering, etc.
Changes in the length of day and night during the year determine the photoperiod, and many organisms are sensitive to it. © Monsieur Fou, Wikimedia public domain
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