The fossil record is barren. There is not one fossil that provides evidence of macroevolution and there should be millions. The largest group of mammal fossils are rat fossils and there has been absolutely no evolution observed.
As far as mutations. Yes, mutations DO often cause death. But, evolution is based on the idea the mutations are good and numerous. The whole theory is based on mutations.
Only an idiot can imagine a whale or dolphin evolving into a mammal. Both mammals and whales and dolphins have multiple functions necessary for land or water. Dolphins or whales could not have possibly evolved. Nor could the duckbilled platypus.
Then, we have a accomplished scientist, Dr. Michael Behe, who proves conclusively in Darwin's Black Box that complex organisms have too many interdependent parts to have evolved step-by-step.
Even many evolutionist acknowledge that evolution is a grossly flawed theory. There isn't one scientist that will claim evolution involves laws. That's stupid to even make the claim and shows how much you've been brainwashed.