I don't have any problem with the idea that the human form resulted from an evolutionary process, with earlier forms meeting the definition of "animal" until finally the cake was finished, ready for actual spirit children of God to start inhabiting the bodies.
In other words, I can at the same time buy the ideas that it took humans millions of years to evolve into their present form and that spirit children of God have been inhabiting bodies on this earth for only about 6,000 years. Before that, I think animal spirits must have piloted the pre-human bodies around.
Now, as to why God would use an evolutionary creative process rather than just forming a ready-made human body is a question I can't answer. I'm just saying that I'm open to the idea of human physical evolution, but not spiritual.
Darn, I should have put this into "Mormonism For Dummies" . . .