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Metacarpus
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Episiotomy
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Carbohydrate
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Paranthropus
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ADP
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Double blind trial
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Nuclear fission
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Zoonosis
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Ester bond
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Scrambling
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Acceleration of the expansion of the universe
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Sodolithic
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Unfractionated heparin
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Pedicellariae
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Compressed air engine
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Protist
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Razorback
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Capstone
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SPOT
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A rare disease
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HCFC
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Basis weight or grammage
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Software
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Geophagia
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LHC
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Necrosis
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Blob
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Follicle
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Ammon's horn
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Hackberry
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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