Trong tự nhiên, giúp cây tức là giết chúng
Todd Palmer, một nhà sinh thái học tại ĐH Florida, đi bộ qua một khu vực nghiên cứu không có hàng rào ở Kenya và nhận ra điều kỳ lạ: những cây keo được bảo vệ khỏi bị voi và hươu cao cổ ăn lá, đang còi cọc và chết dần.
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