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视频简介

As "Alone" enters its fourth season, the competition series shakes things up with a new twist: the contestants are dropped off in a remote location as pairs. Seven pairs of family members travel to a rugged region of British Columbia, where they are separated and dropped off miles apart from each other. Each player must navigate the wilderness to locate his or her partner. Once...。生命是我们这个星球最重要的特征，但是直到最近生命繁盛的原因仍是个未解之谜。新的科学发现现在要为我们揭开这种不可置信的联系、奇怪的生存策略，还有让地球上的生命成为可能的复杂机制。我们将发现为什么巴西的坚果树要依赖一种牙齿尖利的啮齿动物生存；为什么大象对于保持东非的草原意义重大；为什么玳瑁海龟和海绵之间的密切关系对珊瑚礁的健康非常重要。。