Why are experimental set-ups important in scientific investigation? Experiments produce data help support ideas.
Experiments can help make predictions.
Experiments produce new ideas to explain a natural phenomenon.
Experiments will answer all questions in science.

Experiments produce new ideas to explain a natural phenomenon.

Explanation:

In both cases, the controls allow scientists to quantify background variability and reject alternative hypotheses that might otherwise explain the effect of the treatment on the dependent variable. In an experiment, scientists try to manipulate as variables as possible at a time.

d) the constitution rights of native americans and their right to self-government on reservations

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