RESPIRATORY SYSTEM

https://www.youtube.com/watch?v=hc1YtXc_84A


Go inside the human body and see first-hand how the respiratory system works. Vivid animation and real-life examples demonstrate the respiration process, including the transfer of oxygen into the bloodstream and the effect of exercise on the respiratory system.

AT, ON , IN. PREPOSITIONS OF TIME

AT, IN, ON: PREPOSITIONS OF PLACE