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An iron triangle is an alliance between

__________ is a technique used to select a representative sample where each individual has a known probability of being selected.

During the 19th century, the United States adopted a(n) ____________ posture in its foreign policy.

Doctors use Tc-99m in medical scans because it releases gamma radiation that can be detected by imaging equipment. This radiation comes from:

The United Nations Security Council has 10 permanent members.

Women gained the right to vote after the ratification of the ________ amendment. 

The isotope Technetium-99m has an atomic number of 43. How many protons does each atom of Tc-99m contain?

A party’s national committee is an example of its temporary organization. 

The U.N. Security Council resolutions are legally binding.

Which of the following can be considered frames of reference?