The problem for Evolutionists is that the Fossil Record does NOT show gradual development. Instead it shows what is known as the Cambrian Explosion. This is the sudden appearance of animal life, fully formed and unchanged up to the present --- with no record of fossil ancestors prior to them.
An article by geophysicist, Stephen C. Myer sums it up this way, “starting in the 1970s, many biologists began questioning (Darwin’s) adequacy in explaining evolution. Genetics might be adequate for explaining microevolution, but micro evolutionary changes in gene frequency were not seen as able to turn a reptile into a mammal or to convert a fish into an amphibian. Microevolution looks at adaptations that concern the survival of the fittest, not the arrival of the fittest.”8