Question

1. common names are not reliable because they can vary by __________.

Explanation:

Common names are local and not standardized. They can vary across different regions (geographical areas), cultures (cultural groups), and languages (linguistic communities). For example, a plant might have one common name in English - speaking regions and a different one in Spanish - speaking regions. Cultural beliefs and historical uses can also lead to different common names for the same organism. Linguistic differences mean that even similar - sounding words might have different meanings in different languages, further complicating the use of common names.

Answer:

region, culture, and language