根据以下内容回答题：Let US take a look at the chief thing in the story—the human body itself．A human body appears to be rather soft and delicate，compared with that of a wild animal，but it is actually surprisingly strong．Indeed，its very softness and looseness are an advantage；it makes man good at moving about and falling about in safety．Man is the most skillful in movement of all living things of his own size，because he can do so many different things with his limbs．Man’s games show how he can control his own body．No other land creature can swim as skillfully as man；none has such varied grace；very few live as long as he；none is so strong in its natural resistance to disease．Therefore man has a great advantage in his battle against the risks of damage and death that threaten him．It is difficult to kill him as long as he is fed and in good health．Yet every day thousands of people die needlessly，even though man is naturally strong，because of those two killers，disease and starvation，with the battle． Old age?No one can live forever，so one might’suppose that quite a large number of oldpeople would come to the end of their days every year．There is，however，another thing to re-member．During the time it has taken you to read this page，a considerable number of babies have been born somewhere in the wodd—one is born every one and a quarter seconds!Of these babies，one group can be expected to have a good long life of about seventy years，because they were lucky enough to be born in countries where living standards are high． The deadliest of all killers are starvation and disease．We cannot be content until we have mastered them．To do so is one of the most important tasks of our times．

The softness and looseness of man’s body are an advantage because it__________ ．