After you wash your hands with soap and water, it should be acceptable.
Answer:
A callus is a hardening of skin, keratin is the protein which is abundant in callus. Skin is a protective layer against a external environment. Outer layer of skin consist of keratin which is also found in hair. Callus is the accumulation of dead cells result due to friction and pressure exerts on the part in which they are present. The keratin component (keratinocytes) remains undifferentiated in these dead cells which causes hardening in callus.
Answer: simple . They just ask you questions on how you are doing , not all teachers will give you math questions or biology questions . Ask her what the topics will be about .
