There is little consensus among scientists about how macroevolution is said to have happened as can be seen below:

“ When discussing organic evolution the only point of agreement seems to be: "It happened." Thereafter, there is little consensus, which at first sight must seem rather odd. -(Simon Conway Morris, [palaeontologist, Department of Earth Sciences, Cambridge University, UK], "Evolution: Bringing Molecules into the Fold,"

“ "“The history of organic life is indemonstrable; we cannot prove a whole lot in evolutionary biology, and our findings will always be hypothesis. There is one true evolutionary history of life, and whether we will actually ever know it is not likely. Most importantly, we have to think about questioning underlying assumptions, whether we are dealing with molecules or anything else.” - Jeffrey H. Schwartz, Professor of Biological Anthropology, University of Pittsburgh, February 9, 2007”

And this is for you Mr. Adey

Pierre Grasse, who served as Chair of Evolution at Sorbonne University for thirty years and was ex-president of the French Academy of Sciences, stated the following:

“ Through use and abuse of hidden postulates, of bold, often ill-founded extrapolations, a pseudoscience has been created. It is taking root in the very heart of biology and is leading astray many biochemists and biologists, who sincerely believe that the accuracy of fundamental concepts has been demonstrated, which is not the case....
Today, our duty is to destroy the myth of evolution, considered as a simple, understood, and explained phenomenon which keeps rapidly unfolding before us. Biologists must be encouraged to think about the weaknesses of the interpretations and extrapolations that theoreticians put forward or lay down as established truths. The deceit is sometimes unconscious, but not always, since some people, owing to their sectarianism, purposely overlook reality and refuse to acknowledge the inadequacies and the falsity of their beliefs. - Pierre Grasse - Evolution of Living Organisms (1977)