1 To delete one or multiple messages from a conversation or thread, click Messages on the left side of your homepage.The Messages can be found on the upper left side of the News Feed screen. 2  Select the conversation or thread you want to delete messages from. 3  Scroll up until you reach the message youâd like to delete.
Uses. Oxygen is of great importance in the chemical and the iron and steel industries. Its major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application.Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.ts major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application. Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.
The human body uses oxygen in a complex process that we canât describe in a short blog, but suffice to say that oxygen is needed for all the chemical reactions in your body that keep you aliveâand research has shown that cancer cannot survive in an oxygen-rich environment.