Human beings Essay

Submitted By mgill1994
Words: 315
Pages: 2

Scientists are fond of running the evolutionary clock backward, using DNA analysis and the fossil record to figure out when our ancestors stood erect and split off from the rest of the primate evolutionary tree. But the clock is running forward as well. So where are humans headed? Evolution, the science of how populations of living organisms change over time in response to their environment, is the central unifying them in biology today. Evolution was first explored in its semi-modern form in Charles Darwin’s 1859 book, Origin of Species by means of Natural Selection. In this book, Darwin laid out a strong argument for evolution. He postulated that all species have a common ancestor from which they are descended. As populations of species moved into new habitats and new parts of the world, they faced different environmental conditions. When you ask for opinions about what future humans might look like, you typically get one of two answers. Some people trot out the old science-fiction vision of a big-brained human with a high forehead and higher intellect. Others say humans are no longer evolving physically that technology has put an end to the brutal logic of natural selection and that evolution is now purely cultural. The big-brain vision has no real scientific basis. The fossil record of skull sizes over the past several thousand generations shows that our days of rapid increase in brain size are long over.…