The correct answer will be- repetition of the experiment to replicate the data.
Explanation:
Statistics is used in the experiment which increases the chances of the experiment to be reliable and valid. The statistics are performed on the huge data which can be provided either by the large sample size or replication of the data.
Since the analysis of data using statistics is based on the replication of the data which is produced only by the repetition of the study using the same method either by the same researcher or different researcher.
Thus, the repetition of the experiment to replicate the data is the correct answer.
Measure CO2 Levels from around the town to see if the ratio of Oxygen to CO2 is irregular. It's also important to take in factor how much CO2 intake the plantation around them is so you can see what the entire amount is.