Giving out brainliest because I'm in a good mood, comment for it!

What occured in preparations of war

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

Which chinese invention is used to measur the strength of earthquakeswhich chinese invention is used to measure the strength of earthquakes