Which of the following would result in an increase in blood flow?
a. an increase in vein length
b. an increase in blood viscosity
c. an increase in blood pressure
d. a decrease in blood vessel diameter

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.

i got you i did it ya know what it is just needing to fill this in for a quick task!