change the food source use more than one squirrel increase the number of students shorten the period of observation
A student conducts an experiment to determine the average size of acorn that squirrels eat. The student gave several different sizes of acorns to a squirrel. Which action would most likely improve the results?

Options:
- change the food source
- use more than one squirrel
- increase the number of students
- shorten the period of observation

use more than one squirrel