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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