Evolution mixes two things together, one real, one imaginary. Variation is the real part. The types of bird beaks, the colors of moths, leg sizes, etc. are variation. Each type and length of beak a finch can have is already in the gene pool for finches. I have always agreed that there is variation within species. But there are strict limits to variation that are never crossed, something every breeder of animals or plants is aware of. Evolutionists want you to think that changes continue, merging gradually into new kinds of creatures. This is where the imaginary part of the theory of evolution comes in. It says that new information is added to the gene pool by mutation and natural selection to create frogs from fish, reptiles from frogs, and mammals from reptiles, to name a few. Evolutionists tell us we cannot see evolution taking place because it happens too slowly. A human generation takes about 20 years from birth to parenthood. They say it took tens of thousands of generations to form man from a common ancestor with the ape, from populations of only hundreds or thousands. We do not have these problems with bacteria. A generation of bacteria grows in a matter of hours. There are more bacteria in the world than there are grains of sand on all of the beaches of the world (and many grains of sand are covered with bacteria). They exist in just about any environment: heat, cold, dry, wet, high pressure, low pressure, small groups, large colonies, isolated, much food, little food, much oxygen, no oxygen, in toxic chemicals, etc. There is much variation in bacteria. There are many mutations (in fact, evolutionists say that smaller organisms have a faster mutation rate than larger ones). But they never turn into anything new. They always remain bacteria. Fruit flies are much more complex than the already complex single-cell bacteria. Scientists like to study them because a generation takes only 9 days. In the lab, fruit flies are studied under every conceivable condition. There is much variation in fruit flies. There are many mutations. But they never turn into anything new. They always remain fruit flies. Many years of study of countless generations of bacteria and fruit flies all over the world shows that evolution is not happening today.
This is how the imaginary part is supposed to happen: On rare occasions a mutation in DNA improves a creature's ability to survive, so it is more likely to reproduce (natural selection). That is evolution's only tool for making new creatures. It might even work if it took just one gene to make and control one part. But parts of living creatures are constructed of intricate components with connections that all need to be in place for the thing to work, controlled by many genes that have to act in the proper sequence. Natural selection would not choose parts that did not have all their components existing, in place, connected, and regulated because the parts would not work. Thus all the right mutations (and none of the destructive ones) must happen at the same time by pure chance. That is physically impossible.