Answer
Similar type of burrows are formed by all mice even when they were raised in isolation which shows that the behavior of digging burrows was of innate origin rather than learned from other mice.
Work Step by Step
The experimental design should be like where the mice were raised in the absence of other mice or their parents. The behavior of digging burrows and their shape should be observed. In case all the mice show same behavior even when they were cultured in isolation, it may be deduced that this trait is heritable and not acquired by learning.
