35. To study whether the average house cat prefers a chicken-based food or a vegetable-based food, Arianna provided her cat with equal amounts of each kind of food at every meal time for a week. What
is the source of error in her experiment?

She should involve one more than one cat in the experiment.

Explanation:

Errors are the mistakes happened in an experiment that causes results that are inaccurate in nature.

There is one error in the given experiment that Arianna should perform the experiment in more than one cat to find more accurate results. This is so because only one cat will not be able to give all the effects or side-effects of the food and the involvement of more cats will help to find more accurate observation.

Hence, the correct answer is "She should involve one more than one cat in the experiment."