The answer is a relapse. A relapse occurs when a person who has gone into recovery or has been sober for a long time goes back into abusing drugs and any addictive substances. This can also be seen in patients who had shown a period of health improvement goes back to deteriorating state.
Answer:
<em>Longitudinal study
</em>
Explanation:
A longitudinal study (or longitudinal survey, or panel analysis) <em>is a research design requiring repeated measurements of the same variables</em> (e.g., humans) across short or long periods of time (e.g. using longitudinal data).
Studying the elephants across long periods of time to determine their intelligence.
It is often a form of observational study, although it could also be described as randomized longitudinal experiments.
I don't know who De Vaca is but by context clues I would infer that he realized that Native Americans where not the savages they where thought to be.
I think its d. but I'm not sure. plz don't report me if I'm wrong
