Pre-engagement: Perhaps the most common meaning of a promise ring is the commitment to a relationship that is headed toward engagement. When you feel that your partner is the right one for you but you arenât quite ready for marriage, a promise ring is also known as a pre-engagement ring.
There is a big difference between external and internal respiration. External respiration is basically the transfer of gas between respiratory organs such as lungs and the outer environment. It takes place prior to internal respiration.Internal respiration is the transfer of gas between the blood and cells. External respiration also known as breathing refers to a process of inhaling oxygen from the air into the lungs and expelling carbon dioxide from the lungs to the air.Exchange of gases both in and out of the blood occurs simultaneously.here is a big difference between external and internal respiration. External respiration is basically the transfer of gas between respiratory organs such as lungs and the outer environment. It takes place prior to internal respiration.
Extern redirects here. For the job title, see externship. In the C programming language, an external variable is a variable defined outside any function block. On the other hand, a local (automatic) variable is a variable defined inside a function block. As an alternative to automatic variables, it is possible to define variables that are external to all functions, that is, variables that can be accessed by name by any function.