Mention the ways to maintain social harmony?​

What was different about warfare in the early 1800s and early 1900s?

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

Which statement about spreading knowledge of diseases and health around the world is correct?