Answer: During the Civil War, Tubman worked for the Union army as a nurse, a cook, and a spy. Her experience leading slaves along the Underground Railroad was especially helpful because she knew the land well. She recruited a group of former slaves to hunt for rebel camps and report on the movement of the Confederate troops.
Explanation:
The correct answer is D.
<u>It is an observational study</u><u> because the researcher is </u><u>NOT</u><u> manipulating the explanatory variable</u>, whether a person drinks green tea or not, in order to study the effect of the value it takes, over the dependent variable: LDL cholesterol level.
<u>In opposition, experimental studies manipulate the explanatory variable</u> in order to assess the effects caused on the dependent variable by such deviance.
Answer & Explanation:
'Identical twins separated at birth & raised apart' make an interesting subject for research :
- Gives insights into personality variation among twins, despite of having the same DNA
- Idea about 'Nature vs Nurture', to study how birth & environmental factors shape the cognitive & behavioural aspects of twins
- Analysis of heritability of traits, & factors affecting individual differences in ageing
Probable abuses due to inappropriate evaluation & conclusion of study :
- Intentional & wilful exposure to different environment for both the twins
- Psychological distress to a child if the child is raised in a separate, different environment.