Which of the following is the metric (SI) prefix for 1,000?

The appropriate metric (SI) prefix for 1,000 is "kilo." In the metric system, the prefix "kilo-" denotes a factor of 10^3, or 1,000. This prefix is commonly used in various measurements, such as in kilometers (thousands of meters) or kilograms (thousands of grams).

Understanding the metric prefixes is crucial because they provide a convenient way to express large or small quantities. For instance, recognizing that "kilo-" represents a thousand can help you convert units and comprehend larger scales in scientific contexts.

The other prefixes, such as "deca," represent 10; "mega" denotes 1,000,000 (10^6); and "giga" corresponds to 1,000,000,000 (10^9). Each of these serves a specific function in the hierarchy of metric measurements, but for 1,000 specifically, "kilo-" is the correct term.