Question

How are repetition and replication alike and different?

Answer 1

Repetition and replication are alike in that they are both instances of reiteration, or doing something again in the exact same way it was originally done.
In science, repetition is reiterating the act by the originator in the same experiment to ensure that the same results occur under the exact same conditions.

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Answer 2

Repetition & Replication. Repetition is the "repeating“ (multiple trials) of your own investigation for accuracy. Replication occurs when the investigation is "replicated" or copied by a different investigator.