Answer
The mouse is more related to the baleen whale.
Work Step by Step
The mouse has more common nitrogenous bases with the baleen whale then the chicken. Thus, it must be more closely related to the baleen whale.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.