世界最顶级学术期刊Science 最新版
封面故事：Flowers of monkshood, Aconitum napellus, extend laterally from a main stem and open successively toward the apex. This arrangement is one of only three basic flowering structures observed in nature, reflecting the way developmental mechanisms and natural selection interact to constrain biological form, as described on page 1452. Photo: Karen Lee
发表于 2007-6-9 11:05:37
