Answer:
The scientist observed four deer in different locations at various times of the day.
Step-by-step explanation:
The initial purpose of the study is to find 'Food preference' among the white-tailed deer as their primary food source.
If the research is conducted in different location and different time, there will be other factors that influence their food selection other than preference. (such as availability in the region and the existence of carnivores.) . This will threaten the credibility of the claim.