"Let me explain , evolution ( the big picture ) involves a certain kind of animal turning into a different kind of animal , e.g . a reptile turning into a mammal for example ."
"No , it does n't . The big picture of evolution is that it is the observed change in the heritable characteristics in populations of organims over generations . In cases where populations become fragmented , the separate ( reproductively isolated ) segments of the population will accumulate genetic differences . The longer they are separated , the more likely it will be that they will be unable to interbreed if united . This is observed . The result is the establishment of separate species ."
"Let me explain , evolution animal turning into a different kind of animal"
"The big picture of evolution characteristics in populations of organims over generations"