MODEL RELEASED. Biological clock. Conceptual image of a resting boy lying below a tree seen through a watch face,representing the biological clock. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burriel, Oscar |
Taille de l’image : | 3559 px × 2617 px |
Model Release : | Disponible |
Property Release : | Non requis |
Restrictions : |
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