When we use terms such as personal, impersonal, self-talk, common purpose, and audience, we are talking

Communication

Explanation:

According to my research on studies conducted by various sociologists, I can say that based on the information provided within the question when mentioning these terms we are talking about different aspects of Communication. Every one of the terms mentioned in the question is a different aspect or category of Communication, like for example Impersonal communication is Communication with others as if they are objects or roles. While Self-Talk is Communication within us that is specifically about ourselves.

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how many characteristics are used to describe living things?

explanation:

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.