External respiration is a physical process that refers to the  exchange of gases between the environment and the body. Cellular  respiration, meanwhile, is a metabolic proce â¦ ss that occurs within  the cells of the organism.Answered. In Science.xternal respiration is a physical process that refers to the  exchange of gases between the environment and the body. Cellular  respiration, meanwhile, is a metabolic proce â¦ ss that occurs within  the cells of the organism. Answered. In Science.
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Brilliant things to do in Zagreb this March. It's March, and spring is only a hop away. The days are getting warmer, the streets are buzzier and there's plenty of things to do. Keep yourself busy with our round-up of the best events, exhibitions and concerts. RECOMMENDED: Our round-the-clock guide to Zagreb.