Question

1. why did scientists agree to use one system of measurement?

so they could benefit from using the most accurate measurement system
so they could record their data accurately
so they could readily interpret one anothers measurements
so they could develop theories more easily

Explanation:

Scientists use a common measurement system (like the metric system) to ensure uniformity. When everyone uses the same units, it's easier to understand and compare data across different research groups and regions. For example, if one scientist measures length in meters and another in feet, misinterpretation can occur. A shared system eliminates this confusion.

Answer:

so they could readily interpret one another's measurements