Until I read this article that I realized that there were 5 events of extinctions happened on Earth. Mostly happened in those early days of Earth during those dinosaurs days, I wonder how scientist could detect 5 times it happened. Right now there we are on the edge of another extinction. Jungle shrinking, causing those wild animals into urban areas where they got killed by humans. And poaching of some animals as well as over fishing for those fishes and whales and turtles. We all know that the eco system is like a web that links to every type of animal. When a species died off, it will affect the system of those that links to it, causing a breakdown. If that happens how likely would Man survive this?
http://www.ibtimes.com/articles/118285/20110303/earth-species-extinction-mass-sixth-eco-systems-ecology-impact-big-five-extinction-dinosaur-vlunerab.htm
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