Answer:
Control
Explanation:
The west side of the park as a control for the experiment because it will show the rare plants species without the kudzu. I the experiment was only done in areas with Kudzu and the scientist found that there were 3 rare species than then how would they know it this was more or less normal? Also, how would the scientist know if was the kudzu that caused the change? The west side experiment helps to answer those questions. If 3 rare species were also found on the west then we would not see any connections between kudzu and the species.