What is a Promise Ring. A promise ring, sometimes known as a pre-engagement ring, is a simple piece of jewelry that is given as a symbol of a committed, monogamous relationship. In some cases, the promise ring symbolizes purity and a decision to remain celibate until marriage.
Noun. 1. external respiration-the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation. breathing, respiration, ventilation. artificial respiration-an emergency procedure whereby breathing is maintained artificially.
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.