Answer:
D: Africans became sickened by diseases brought by European migrants
Explanation:
Even though north Africa had been in touch with the Europeans for a good time, Middle and South Africa was separated by the the Sahara Desert which meant that diseases did not travel to the rest of the continent
Answer:To Prevent Bias which may arise from a major difference from personal characteristics.
Explanation: Sampling is a part of a population that is to be used for a research or experiment.
Variables are factors or members of a sample or Population that are can be altered (Dependent variables) in order to create an effect on another variables.
Independent variables are variables that are consistent and are not affected by other variables.
To Prevent BIAS,proper Sampling or inducing independent variables it must include all the factors necessary in an experiment or research.
Answer:
The answers are actually A and C
Explanation:
From usatestprep
<span>Verdun was the major battle located in the northeast area of france, I think. It it's the war I think you are talking about but you should really say which war.</span>
I'm guessing "overcoming difficult barriers"
