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Repetition and replication help to make an experiment reliable.

Repetition

Some experiments can be repeated such as taking UV beads outside and recording how fast they change colour. You can repeat this many times and this will reduce any errors in your results.

Replication

Other experiments cannot be repeated such as popping a balloon or growing some seeds. You cannot repeat the experiment because you can’t go back and unpop the balloon or change the plants back into seeds. In this case you use replication and use a number of seeds or balloons as replicates of the experiment.