How Many Species Are There?
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[MUSIC] Let’s imagine extraterrestrials land on Earth tomorrow, only they’re not here to enslave and destroy humanity, they’re just galactic census takers. Then let’s imagine instead of our generals, or world leaders, they want to speak to our scientists. You know, the important people. Their first question, might be “How many life forms reside on this planet?” And the answer is… um, uh, well… umm. We don't know. [MUSIC] Hey smart people, Joe here, and as a biologist, this is kind of embarrassing to admit. We don’t know how many species there are on Earth. 5 million? 10 million? Unless you want to count microbes and extinct species too, then maybe a trillion? It’s the answer to one of the most basic questions about life, and those a...
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[MUSIC] Let’s imagine extraterrestrials land on Earth tomorrow, only they’re not here to enslave and destroy humanity, they’re just galactic census takers. Then let’s imagine instead of our generals, or world leaders, they want to speak to our scientists. You know, the important people. Their first question, might be “How many life forms reside on this planet?” And the answer is… um, uh, well… umm. We don't know. [MUSIC] Hey smart people, Joe here, and as a biologist, this is kind of embarrassing to admit. We don’t know how many species there are on Earth. 5 million? 10 million? Unless you want to count microbes and extinct species too, then maybe a trillion? It’s the answer to one of the most basic questions about life, and those a...
