The first of these is natural selection -- that's random mutation and selective retention -- along with our basic anatomy and physiology -- the evolution of the pancreas or the eye or the fingernails.
第一个是自然选择-- 这是中是随机的基因突变和选择性保留-- 与我们基本解剖学和生理学结构一起-- 如胰腺、眼睛或指甲的进化。