natural selection

名词 natural selection:

1. a natural process resulting in the evolution of organisms best adapted to the environment
   同义词：survival, survival of the fittest, selection

1. A systematic long-term change of this kind suggests the action of natural selection and indicates that female skeletal characteristics confer greater fitness. But is this the whole story.
   这种长期的系统变化说明自然选择的作用，并表明女性骨骼的特性较大的适应性。但是，情况完全是这样的吗？