which of the following statements about good experiments is true?a good experiment should hold potentially confounding variables constant between groups. none of the abovea good experiment must have an experimental group. a control group may be useful but not critical. a good experiment should only include replication if the hypothesis has never been tested before. Help me please

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which of the following statements about good experiments is true?a good experiment should hold potentially confounding variables constant between groups. none of the abovea good experiment must have an experimental group. a control group may be useful but not critical. a good experiment should only include replication if the hypothesis has never been tested before. Help me please

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vascular tissue transports materials from the environment into the plant.