User: hand-washing and good hygiene are the best defense against?
a. the flu
b. common cold
c. rabies
d. hepatitis a
e. aids

What is the main causes of gray hairs and balding? write your answer in 2 paragraphs

Charlie is easily winded during soccer practice and wants to improve his cardiorespiratory fitness. which activity would be best for him to choose? lifting weights walking from one class to another running in a 5k race riding a bike at a leisurely pace

Which hormone controls the production of sperm