Answer: A)Control : no photograph
Dependent: whether they returned it or not
Confounding:time of day
B) people have the need to see themselves as righteous so to raise their self esteem and maintain their image they’ll do something good
C)they valued their own interest ?? (Not sure)
D)maybe the ppl who picked up the wallets were young, so the older couple’s photograph would be an out group “them” compared to the young “us”
E)higher
Explanation:
The answer is B. The circular model illustrate the flow of income and expenditure, and expresses how change by with consumers or producer can influence the other. If consumers were spending less, then producers would lower their production to match the consumer demand for that good or service.
Agriculture required a setting down, overall density of populcation in agricultural areas increased substantially, true food surpluses becames possible, food supple was more regular schedule, greater division of labour.
hope this helps
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Limitations are important to understand for placing research findings in context, interpreting the validity of the scientific work, and ascribing a credibility level to the conclusions of published research. This goes beyond listing the magnitude and direction of random and systematic errors and validity problems.