A general rule relating the capacity of a specific animal's digestive system to provide adequate access to substrates for biosynthesis of cellular components, as well as fuel molecules needed for ATP production, is that the animal should have access to

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The best choice is a diet that matches chemical energy, essential nutrient, and organic molecule building blocks per species. This is because different species require different amounts and types of nutrients, based on their size, metabolic rate, and other factors. A diet that provides the appropriate nutrients in the right proportions will ensure that the animal can synthesize cellular components and produce ATP as needed. A high-protein, low-carbohydrate diet (A) may not provide enough carbohydrates for energy, while a diet low in lipids and high in protein (B) may not provide enough lipids for energy storage. A low-calorie diet with a large intake of fluids (C) may not provide enough nutrients for building cellular components and producing ATP. A diet that maximizes vitamins and minerals (E) is important, but not sufficient on its own to support the animal's metabolism.

A General Rule Relating the Capacity of a Specific Animal's