How often should people wash their hands to maintain good personal hygiene? once per day
at least twice per week
whenever their hands are visibly dirty
whenever they touch unclean surfaces

Ruth is 44 years old. at her medical checkup, her doctor notices that ruth's lymph nodes are enlarged. after some blood tests and a ct scan, ruth's doctor diagnoses her with ( ) , a cancer that typically starts in the lymphocytes and can spread to the bone marrow.