The first humans, in order to find enough food, often lived a erratic life and drifted to a place, that is, to find a temporary overnight lodge. This often-migrating but comfortable way of living should be regarded as a human A transitional stage before the nest form enters the cave form. The most correct summary of the "transition stage" in the text is:. ['Humans often lead a erratic life in search of food.', 'Wherever humans find food, they live there.', 'Where to wander, that is, find a temporary overnight accommodation.', 'A form of living that often migrates but feels comfortable.']