1. By how much did the three organisms investigated in this activity grow over the course of ten weeks when the average water temperature was 20ºC? (You may wish to save the graphs of data to your computer and paste them below to help answer this question.)

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.

it is a. i hope this .