Creatine.
If a substance is said to have a natural abundance of isotopes, it means the substance is found in large numbers in nature with an electric charge. Substances found in nature are usually electrically neutral.
Many. for example coal, wood, natural gas, gasoline, ...
Innumerable examples occur. From apple juice to the very elements themselves. Fruit juice is a compound of many materials. Many elements have isotopes - Tin has almost 30 isotopes - most non natural. Sulfur has four natural ones, and even hydrogen has a couple of natural isotopes.
This is a fact. It can be verified by way of experimentation, and is true regardless of what anyone believes or disbelieves.
The term "non-renewable" means that an existing arrangement or contract cannot be extended. It is also applied to natural resources that cannot be replenished or replaced as they are used up, or at least not in a reasonable time frame. These resources can also be characterized as "exhaustible."
Both turkey and chicken contain creatine. This is a natural substance used found in muscles which aids in muscle recovery.
An element is a substance in its pure and natural form.
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a natural substance is something that is found again and again in many different forms eg. salt (also a reoccurring substance)
Exercise is the natural way to "grow" muscles, though there is no growing actually involved. If you want larger, better defined muscles, you work out.
sunlight
Yes.
Natural gas, gasoline, and kerosene are some fuels made from petroleum.
Natural gas is a physical substance.
Natural Resource
Yes, stone is a natural substance, not man-made.
Natural gas is a physical substance.