Neither, a cooper is someone that traditionally makes barrels.
Copper is an element itself Symbol Cu Not a mixture like brass or bronze etc.
An element - substance - NOT a mixture.
a mixture is not a substance
a mixture is not a substance
No, it is a mixture; rarely a drug is a pure substance.
sperm is a substance. Semen is a mixture.
a mixture
pure substance?
Ice cream is a mixture.
Pure substance.
It is a mixed substance. ---------------------------------------------- It is a mixture
It would be an mixture