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Answer 1

21) Separting funnel is the object can be used to obtain mustard oil from the above mixture.

Answer 2

Answer:

23. Chronic disease is a long-term disease and is more complicated than acute disease. Hence, chronic disease is more harmful than the acute disease.

24. AIDS' stands for Acquired Immuno Deficiency Syndrome. Its causative agent is Human Immunodeficiency Virus (HIV). It is transmitted from an infected person to a healthy person in the following ways.