Here’s a “nifty” question for Evolutionists...With every “Leap Forward” on the Evolutionary ladder, the arising Life Form needed a more complex Protein and Nutritional chain in order to survive, let alone thrive. Since this would involve the “fine-tuning” of the entire environment, how we accept that this PRE-EVOLUTION EVOLVING could transpire successfully thousands of times su the ecosystem would be ready to support the newly arisen form?
Actually your question revolves around an incorrect assumption. At each "leap forward" all that was needed was a different adaptation.
With the normal range of variation, supplemented by mutations, at each generation there are thousands to billions (depending on the species) of "experiments" at adaptation. Of those, the failures are removed. Each succeeding generation, then, is descended from the successful adaptations. This powerful feedback mechanism works quite well unless the failures become to great (with rapidly changing environmental conditions, for example), then you get extinction and an open niche for some other more successful species to expand into.