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It took a long time to get to where we are today and several theories exist as to how we got here in the first place. But which are true?____________________Follow Trace on twitter: http://twitter.com/tracedominguezFollow Seeker on twitter: http://twitter.com/seekerAnd, subscribe on YouTube too: http://youtube.com/seekerSeeker inspires us to see the world through the lens of science and evokes a sense of curiosity, optimism and adventure.Visit the Seeker website for more science coveragehttps://www.seeker.com/ Learn more about your ad choices. Visit megaphone.fm/adchoices