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human respiratory system lungs flat vector design
Structure of the epidermis layer during cell turnover. Desquamating cell are out of at the top layer. New cells start at Basal layer.
The circadian rhythms are controlled by circadian clocks or biological clock these clocks tell our brain when to sleep, tell our gut when to digest and control our activity in several day.
Priestley's experiment demonstrated that plants release oxygen, supporting animal respiration and proving the link between photosynthesis and respiration.
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