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This episode of Stated Clearly was made possible through generous donations by Bird and Moon Comics Incorporated ProofAvenue and contributions from individual viewers like you. Stated Clearly Presents What is Evolution? In biology, the Theory of Evolution doesn't tell us exactly how life began on earth — but it helps us understand how life — once it came into existence — diversified into the many incredible forms we see now and in the fossil record. It also helps us make sense of the way in which modern creatures continue to adapt and change today. In biology, evolution can be defined as any changed in the heritable traits (those are physical traits like fur color in mice spots on the wings of butterflies or instinctive behaviors like the way in which dogs greet their friends with a sniff) within a population across generations. This definition can be a bit confusing so let's see how it works all healthy living things from single celled amoebas to flowers to dolphins are capable of reproduction. We have children, we make copies of ourselves. We do this by duplicating DNA and passing that DNA on to future generations. DNA is a chain like chemical stored inside each one of your cells which tells them how to grow and function. Your DNA contains coded information on how to build you. The information in your DNA is different from that of say a daffodils DNA, which is why you look and function differently than a daffodil. The information in your DNA is slightly different from that of Elvis Presley, which is one of many reasons you don't look a and act quite like he did. Single celled amoebas and other simple creatures reproduce by copying their DNA — inside their guts — moving both copies to either side of their body, splitting in two right down the middle and then growing back to full size. If all goes well the two new amoebas will be exact copies of each other. But in nature things aren't always perfect. When DNA is being copied, errors can occur which modify the DNA code. This is what we call a DNA mutation. These mutations, which happened completely on accident and randomly to any part of a DNA strand, can produce variation in the body shape and function of the creature who inherits the modified DNA. In this case, our new little friend has an arm that stretches extra long. If he survives long enough to grow and reproduce that extra stretchy arm (which is now coded for his DNA) will be passed on to his children. Evolution: any change in the heritable traits within a population across generations has officially occurred. Reproduction for dolphins and badgers and people are a little more complicated. We have to find ourselves a partner. When to a badger get together, and you know...fall in love a sperm cell from the father which contains a copy of half of his DNA — only half — combines with the egg cell of the mother which contains half a copy of her DNA the result is a brand-new cell with a complete set of DNA instructions all the information needed...
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