Simple Sex and the Birth of Gender | Battle of the Sexes in the Animal World | BBC Earth

About a billion years ago simple single cell animals mated and everything was a lot more simple. Until a quirk of evolution changed all that, resulting in one of the most significant events in life on earth...Subscribe to BBC Earth: http://bit.ly/ydxvrP Earth YouTube Channel: http://www.youtube.com/BBCEarth BBC Earth Facebook http://www.facebook.com/bbcearth (ex-UK only) BBC Earth Twitter http://www.twitter.com/bbcearth Visit http://www.bbc.com/earth/world for all the latest animal news and wildlife videos Watch more videos from BBC Earth: Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth http://bit.ly/PlanetEarthPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur http://bit.ly/PlanetDinoPlaylist Check out the other two channels in our BBC Earth network: BBC Earth Unplugged: http://bit.ly/BBCEarthUnplugged BBC Earth Lab: http://bit.ly/BBCEarthLabYouTubeChannel About BBC Earth: The world is an amazing place full of stories, beauty and natural wonder. Jump in to BBC Earth's YouTube channel and meet your planet. You'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content on here. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. Subscribe to be the first to view new videos. And you can become part of the BBC community by checking out our BBC Earth Facebook page. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community. This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/