更多"To understand better the forces tha"的相关试题:
[填空题]To understand better the forces that control human aging and longevity, we have tried to determine whether the longer lifespan of females might be part of some grand Darwinian scheme. Gender differences in longevity have been (51) in other members of the animal kingdom: in fact, in almost all species that have been observed in the wild, females (52) to live longer than males. Female macaques live an (53) of eight years longer than males, for example, and female sperm whales outlive their male (54) by an average of 30 years.
It seems that a species’ lifespan is roughly correlated (55) the length of time that its young remain (56) on adults. We have come to believe that (57) a significant, long-term investment of energy is required to ensure the survival of offspring, evolution favors longevity—in (58) , female longevity. Indeed, we believe that the necessity for female (59) in the human reproductive cycle has (60)