Exact, agreed-upon quantity used for comparison.

control? baseline? reference?

Non of those work because I'm working on this crossword puzzle, and the word is 8 letters long and ends with a D.

Meagan -- It would have helpful to you and to us if you'd given this information in your first post. We are intelligent, educated tutors, but we are not clairvoyant.

I am sorry, this is homework but this is all that is on each statement.

I am sorry, this was all I had on the puzzle and it is homework that I had in Physical Science.

The exact, agreed-upon quantity used for comparison is known as a standard. It serves as a reference point or baseline against which other quantities can be measured or evaluated. Standards are essential for ensuring consistency, accuracy, and reliability in various fields, including science, engineering, manufacturing, and trade.

To determine the exact, agreed-upon quantity used for comparison in a specific context, you can follow these steps:

1. Identify the field or domain in which the comparison is being made. Standards can vary depending on the discipline or industry involved.
2. Research any established standards or guidelines that govern the specific comparison you are interested in. Standards organizations, professional associations, or regulatory bodies often define and maintain these standards.
3. Consult relevant reference materials, such as technical documents, textbooks, or research papers, for information on recognized standards in the field. These sources can provide details about the specific quantity used for comparison.
4. Consider any specific requirements or considerations that may influence the choice of a standard. This could include factors such as accuracy, precision, units of measurement, or specific calibration procedures.
5. Engage with experts or professionals in the field who have knowledge and experience in the area of comparison. They can provide insights into the standard typically used and any considerations to be aware of.

By following these steps and conducting thorough research, you can find the exact, agreed-upon quantity used for comparison in a given context.