Final answer:
Replication is the correct answer to this question. In research, replication is important for ensuring the reliability and validity of the results.
Step-by-step explanation:
Replication is the correct answer to this question. Replication occurs when many aspects of a study are carried out again, but others are modified, beyond just the sample. In research, replication is important for ensuring the reliability and validity of the results. By replicating a study, researchers can test if the same results can be obtained multiple times, which adds confidence to the findings. For example, if a study found a certain treatment to be effective in reducing symptoms of a disease, replication would involve carrying out the study again with different participants and conditions to see if the same results can be achieved.