Answer:Internal Invalidity
Explanation:
Internal Invalidity means something else produces the outcome that is observed in a research and is a result of the conclusion made from that experiment , something else other than the actual stimulus that was meant to produce those results in an experiment. This means these result may not be a true representation of the research outcome because something else has intervened and had it effect on the participants. Dependent variable are affected by something else outside of the experimental stimulus.
"participants get more benefit from the human contact of a research " this is something else other than the clinical treatment.
They were both important and happened in history, so there for yes.
Primary resources contain first-hand information, meaning that you are reading the author's own account on a specific topic or event that s/he participated in. ... Examples of a primary source are: Original documents such as diaries, speeches, manuscripts, letters, interviews, records, eyewitness accounts, autobiographies
Ummm... ok? I have no idea what's going on here?....
Answer:
by growing and selling tobacco
Explanation:
hope this helps :)
