inorganic.
Gravel is an inorganic material typically made up of small, rock fragments. It is not considered organic because it does not contain living organisms or come from once-living materials.
Concrete is an inorganic compound made of a mixture of cement, water, and aggregates such as sand and gravel. It does not contain organic materials like carbon and hydrogen typically found in organic compounds.
Lecithin is an organic compound.
inorganic
it has an organic macrocycle and an inorganic metal at the centre
inorganic
Inorganic
inorganic
they are inorganic
it is inorganic
inorganic
it is inorganic