Four billion years of evolution in six minutes - Prosanta Chakrabarty
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So how did fish evolve into walking land animals? A new genetic study from scientists at New York University reveals something surprising: Fish called “little skates” possess the genetic blueprint that allows for the right-left alternation pattern of locomotion that four-legged land animals use. Those genes were passed down from a common ancestor that lived 420 million years ago, long before the first vertebrates ever crawled from sea to shore. In other words, some animals may have had the neural pathways necessary for walking even before they lived on land.
What other misconceptions do we have about evolution? A popular misconception is that natural selection and evolution are the same thing- but natural selection is just one mechanism of the evolution process. Others include: organisms are always getting bigger and that evolution is about the origin of life.
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The elephant is a creature of epic proportions — and yet, it owes its enormity to more than 1,000 trillion microscopic cells. And on the epically small end of things, there are likely millions of unicellular species, yet there are very few we can see with the naked eye. Why is that? Why don’t we get unicellular elephants? Or blue whales? Or brown bears? Murry Gans explains.
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