Which of the prefixes represents one billion?

The prefix that represents one billion is "Giga," which corresponds to the factor of 10 raised to the 9th power (10^9). In the International System of Units (SI), "Giga" is commonly used to quantify large amounts, particularly in contexts such as computing (e.g., gigabytes) and scientific measurements.

The other prefixes listed have different scalar values and are commonly used for smaller quantities. "Mega" denotes 10 to the 6th power (1 million), "Kilo" represents 10 to the 3rd power (1 thousand), and "Deca" signifies 10 to the 1st power (10). Understanding these prefixes is essential for interpreting data in scientific, engineering, and technological contexts, where accurate representation of scale is critical.