How does the washing of hands prevent a societal problem?
a. it keeps water supplies clean.
b. it treat inherited disease.
c. it protect the environment.
d. it reduces the spread of disease.

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year