Answer:
A.
Explanation:
take water for example. when it is cooled past 0° C it freezes. when that ice is heated again, it will melt at 0° C. think of it like 0° is the line between the two states.
Researchers must utilize a control group in a scientific study because <span>it is important to show that between two groups that were similar from the beginning of the study, the one that received the manipulation is the one that changes. Note that the control group is the group in the experiment that does not receive manipulation by the experimenter and is thus used as basis for how the other test subjects changed. </span>
Answer:
Popular sovereignty; Kansas-Nebraska Act.
Explanation:
Popular sovereignty is a concept that says that government is created and sustained by the people.
The Kansas-Nebraska Act was a popular sovereignty where was allowed settlers of territory to decide whether slavery would be aloud or not in the new state's borders. This was an important part in the organisation of western territories in 1854.
