Answer:
Poor sanitation decreases the life expectancy of a population.
Step-by-step explanation:
Poor sanitation causes a health hazard, health hazards cause diseases, especially those that relate to the digestive system.
Some of these diseases are fatal while some of them are extremely harmful. If proper medication is not taken early enough they might end up fatal or even chronic.
This is where life expectancy comes in ;
When a good percentage of the population is affected by diseases resulting from poor sanitation then statistically, the life expectancy is very low.
An example is the third world countries in Africa like Zimbabwe where diseases affect a great number of people hence the life expectancy is critically low.