Safrole, a colorless or slightly black oil, extracted from the root-bark or the fruit of sassafras plants is the primary precursor for all manufacture of MDMA (ecstasy).
It is a man-made material.
Silicon is a naturally-occurring substance.
It is natural but there are man-made imitations.
It can be made from natural or man made fibres.
Rubber is man-made but has natural agents.
It is a man-made material.
Yes, stone is a natural substance, not man-made.
It's a natural substance
It's a natural substance
No, aspartame is a man-made substance for which the maker has a patent.
Silicon is a naturally-occurring substance.
Diphtheria is a disease caused by a bacteria. It is entirely natural, unfortunately.
Because it's natural, it's grown not man made
When a harmful substance poisons any thin natural Its usually man-made
Diamonds are a naturally occurring substance found deep in the earth's crust.
Diamonds are a naturally occurring substance found deep in the earth's crust.
It is natural but there are man-made imitations.