Show SCIENCE VS NE OH Geographic races of plants or animals differing differing dif dif- fering noticeably but only slightly from the parent species do not have the importance in establishing new evolutionary I lines of descent de descent descent de- de scent once ascribed to them These slightly varying lines of descent within a species en enable enable enable en- en able the plant or animal group to adapt themselves themselves themselves them them- selves to the special conditions of their en environment environment environment en- en but they never become marked enough to set any of the subgroups off as new and independent species |