Which of these statements indicates an experiment is systematic?

well, the definition of systematic is: done or acting according to a fixed plan or system; methodical. so the answer would be (D).
Answer:
The correct answer is D).
Explanation:
The systemic method is a method ordered by rules, which will allow us to arrive at an understanding of a given situation.
It consists of rationally gathering several dispersed elements into a new whole. It is also a method that consists of identifying rules, series of patterns and events to prepare us for a new investigation.
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