Mary knows that pouring a liquid into a different shaped container does not change the amount of liquid. She can also reason logically, but she cannot handle abstractions such as proverbs. According to Piaget, Mary has probably achieved the stage of cognitive development.

An economic system where all or most businesses are owned by government

Which social media guideline defines what to do if you find a fabrication on a social media site?

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.