The answer is D. Just go and look up the definition on google and it will give you your answer.
In some research, the researchers are not able to use random assignments to divide participants among groups. Instead, they compare preexisting groups, which results in a quasi-experimental design.
Random assignments are those which are given as a matter of chance to ensure fairness and equal opportunity for all participants. Here participants forming multiple groups are with similar characteristics. So all groups are the same at the start of the experiment.
A quasi-experimental design applies a non-random method, and subjects are assigned to preexisting groups. There are some situations where true experiments can't be used for practical reasons. In such cases, a quasi-experimental design is a suitable tool.
To learn more about quasi experimental design here
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1. and 2. farmers sowed and harvested crops during seasons around the flooding.
3.They worked to pay off taxes
4. Tame animals
5.Farmers had to go hunting for antelope in the desert beyond the hills
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Answer:
what time period? It could change a lot over time
A. To pay taxes and serve in the military