In macroevolution- iin evolution of species A to species B, you need to explain all- if not most changes. Just showing bony changes ( fossils) is just the tip of the ice burg and grossly inadequate. These include, anatomy, biochemistry, physiology, biomechanics, cardiovascular, respiratory, Gut, genito urinary system, sexual and reproductory system, brain and nerve system, muscles, haematology, immunology , skin, eyes/ hearing/ vestibular systems. You compare any close species and such MOUNTAIN of differences could be seen. Evolution based on random mutations need to explain at least most differences. Also as many systems are interlinked and interdependent, it is likely that simultaneous changes in many systems are needed. In evolutionary mechanics, it is vital to address such issues- not only fossils !!!
In macroevolution- iin evolution of species A to species B, you need to explain all- if not most changes. Just showing bony changes ( fossils) is just the tip of the ice burg and grossly inadequate. These include, anatomy, biochemistry, physiology, biomechanics, cardiovascular, respiratory, Gut, genito urinary system, sexual and reproductory system, brain and nerve system, muscles, haematology, immunology , skin, eyes/ hearing/ vestibular systems. You compare any close species and such MOUNTAIN of differences could be seen. Evolution based on random mutations need to explain at least most differences. Also as many systems are interlinked and interdependent, it is likely that simultaneous changes in many systems are needed. In evolutionary mechanics, it is vital to address such issues- not only fossils !!!