Bears, with their keen intelligence and adaptability, have managed to thrive in a variety of habitats, ranging from dense forests and grasslands to icy tundra and mountainous regions. Their ability to adjust to diverse environments is a testament to their evolutionary success, as they have become apex predators in their respective ecosystems. The polar bear, for instance, has evolved to master the harsh Arctic conditions, relying on its powerful limbs and keen sense of smell to hunt seals on sea ice.

The heart is a vital organ in the circulatory system, responsible for pumping blood throughout the body. It is a muscular organ located in the chest, slightly left of center. The primary function of the heart is to ensure the circulation of oxygen, nutrients, and hormones to various tissues and organs, while simultaneously removing waste products. Comprised of four chambers - the left and right atria and ventricles - the heart operates in a coordinated rhythmic pattern known as the cardiac cycle. This intricate process involves the contraction and relaxation of the heart muscle, facilitating...