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Wolf, Max
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Appendicitis
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Bituminous shale
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Hot-plug
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Phytates
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Stall angle
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Differential interference contrast microscope
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Glinide
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SIM microscopy
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Server
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Chalcophile
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WEEE
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Quaoar
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Hadean
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Stephan's quintet
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Inertia
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Cryovolcanism
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Mammography
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Additional energy
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Spirit
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Covalent bond
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Mach number
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Chirality
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Jupiter
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Phenobarbital
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Marburg fever
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Mole
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Internuptial
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Algal film
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Moon
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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