Through checks and balances
Explanation:
Contamination can have undesirable consequences in real experiments, some of them are related to the feelings that may arise in the research participants, the contamination bias reduces the differences between the research groups, and can cause a comparison between the treatments of each different group, the which can generate conflicts and rivalries on the part of groups that consider themselves to be inferior to others. These contamination-related problems can significantly interfere with the research results.
Answer: Scaffolding
Explanation: Scaffolding can be simply defined as an instructional method of teaching where an instructor guides his or her students through a step required to complete a task and as they become efficient, he or she begins to withdraw his influence or involement in the guidance process and only give assistance to them if they really need it.
Mr Reeese guided his students through a concept lesson before withdrawing his involement and gave them a challenging task, he monitored and constantly drop hints to help the new students connect prior learning to the new concept.
Mr Reeese was providing Scaffolding.
There were specific terms used to divide people into different classes based on their parents races
Explanation:
The answer would be Density.
