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Global selective value
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Abattage (bird care)
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Femtosecond
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Oxfam
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Melanism
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Electroencephalogram
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POP3
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Aerobic glycolysis
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Ophidian
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Piezometer
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Greisen
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SECAM
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DTS
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Mesosphere
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Antivenom
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Spreading (agricultural practice)
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Cellular respiration
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Adduction
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Neoteny
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Pylorus
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Firewire
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Systemic antifungal
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Twin
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Hartley 2 comet
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Bok globules
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Hanbury Brown–Twiss effect
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Planck time
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M17
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Poliomyelitis
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Arthritis
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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