哺乳类动物因此获得了生存空间，并最终演化出有工具武装、具备语言能力的直立猿类，有人认为，它们的力量对地球的改变之大几乎可以和那颗小天体相提并论。
With that, there was space for the rise of mammals and, eventually, the evolution of a tool-wielding, linguistically capable, bipedal ape with the power, some argue, to have almost as transformative an impact on the planet as that celestial body.