The cartilage formation which divides the trachea from the esophagus during swallowing is called

The cartilage formation dividing the trachea and the esophagus is known as epiglottis.

The epiglottis has the function of closing the entrance to the windpipe (pharynx) and lungs, avoiding food from entering those.

The image down below might help you get a better idea of what an epiglottis looks like.

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When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.