The clause says that the national government by make all laws "necessary and proper to carry out enumerated power. supremacy full faith and credit elastic inherent powers

The answer for the blank space is "Elastic" or "necessary and proper clause".

To make all Laws which should be important and appropriate for conveying into Execution the enumerated powers, and every single other Power vested by this Constitution in the Legislature of the United States is mentioned in the elastic or necessary and proper clause

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;

no the answer is c only objects touching the earth's surface can be acted upon by an outside force