Which of the following is true about the measurement of milliliters to liters?

The relationship between milliliters and liters is based on the metric system, where volume measurements are straightforward and easily convertible. One liter is defined as equivalent to 1,000 milliliters. This conversion is fundamental in metric measurements because milliliters are often used for smaller volumes, while liters are used for larger volumes.

To further understand this, it's helpful to visualize the metric system's decimal-based structure, which makes it easy to convert between different units of measurement. Since there are 1,000 milliliters in one liter, if you were to measure out a full liter using a milliliter measuring instrument, you would need to fill it to the 1,000 milliliter mark. This practical understanding underscores the relationship: 1 liter is, therefore, always 1,000 milliliters, confirming that the provided answer is correct.