Multiple choice The correct sequence of animals that are arranged in increasing rate of heart beat is Sparrow - Cat - Horse - Whale Whale - Horse - Cat - Sparrow Whale - Sparrow - Cat - Horse Whale - Sparrow - Horse - Cat Reveal answer Fill a bubble to check yourself B Correct answer Explanation Lower the size, slower the heart rate. This is because the heart has to handle large volume of blood flowing through the same narrow terminal capillaries.