The right answer is screening test.
In medicine, screening consists of looking for one or more diseases or abnormalities known as "at risk" in individuals of a given population.
These investigations are followed or not by medical consultations, clinical examinations and treatments.
In addition, screening is a preliminary procedure (test or examination) to detect one or more characteristic signs or symptoms of a disease or syndrome and potentially leading to further investigation.
Iron filings can be attracted by the magnet whereas salt can not. So the mixture can be separated by a magnet
Answer:
It's compound? It's chemical compound would be represented my letters or numbers
Gasses is the one because gas and gasses
