Alllivingthingsontheearthneedotherlivingthingstolive...
问题详情： Alllivingthingsontheearthneedotherlivingthingstolive.Nothinglivesalone.Mostanimalsmustliveinagroup,andevenaplantgrowsclosetogetherwithothersofthesamekind.Sometimesonelivingthingkillsanot...