Select the most appropriate one-word substitution for the given group of words. 

An argument that is complicated and continues over a long period of time.

Wrangle

The most appropriate one-word substitution for an argument that is complicated and continues over a long period of time is wrangling.

• Mixed means consisting of different elements.
• Carcass means the dead body of an animal.
• Dower means the property that a wife receives from her husband at the time of their marriage.

The word wrangling is derived from the Old English word wrenclian, meaning "to twist" or "to struggle". It is an argument that is heated and often inconclusive. Wrangling can be about any topic, but it is often about something that is complex or difficult to resolve.