Answer:
how the secondary data were collected.
Explanation:
Secondary data refers to the data that is collected by other persons beside the researcher who actually use it. (in this context, it would be the data that is collected by other person than Marvin).
Sometimes, the collection method could influence the data given by the samples and will shaken up the overall conclusions.
I'll give you an example.
In market research, companies often conducts research to find out consumers' preference toward a certain product. This preference could be given by the people through either public survey and private survey. Most people tend to give a more truthful answer if the data is collected through private survey since answering in public survey makes the people fear a chance that they will be judged by others.
Answer:
Brazil’s healthcare system continues to improve.
Explanation:
An improved healthcare system means a reduced mortality rate hence will have a variable impact on population increase.
Answer:
C. Varieties of an element that differ only in the number of neutrons are called isotopes.
Explanation:
The Earth is approximately 
old. The solar system formed from giant gas clouds which was a part of the solar nebula.
The surface of soil which demarcates two soils of different geological ages is called a unconformity.
Palesol is the soil that lies between sediments or volcanic deposits. If the paleosol is older they have lithified rock.
Hence, option C is true.
Answer:
1) World War 2 wars
2) Civil Rights Movements
Explanation:
1) Attack on Pearl Harbor, being specific, anyway, they caught the US off gaurd and forced their entry into the war.
2) They forced the war to change its ways and the way they saw black people.
(So sorry for very weak answer but had to do this in like 2 minutes. Sorry!)
