How did the concept of "race" develop by the mid-nineteenth century? How did it enter into the manifest destiny debate?

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

Risk of harm in social and behavioral sciences generally fall in three categories, which are: breach of confidentiality, loss of autonomy, and study proceduresstudy procedures, breach of confidentiality, and loss of employmentinvasion of privacy, adverse reaction to study drug, and discriminationinvasion of privacy, breach of confidentiality, and study procedures

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?