There is a limestone cave near the city of Naples in Italy. People brought large animals such as cattle and horses through the cave without problems, but small animals such as cats and mice fell into the cave and died. Later, after inspection, it was found that the small animals died. Related to inhaling large amounts of carbon dioxide. From this, it can be inferred:. ['Severe hypoxia in the limestone cave.', 'Large animals are more adaptable to hypoxic environments.', 'Both man and cow are equipped with oxygen equipment.', 'Carbon dioxide is deposited on the ground inside the limestone cave.']