Which diagram best represents the percentage of this radioactive isotope sample that will remain
after 2 half-lives?
select one:
a. diagram 3
b. diagram 4
c. diagram 2
d. diagram 1

c. establishing proper sleep hygiene

the correct answer to this question is #5

idk im sorry.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.