-The morality of law and duty to the social order
-A rational calculation of benefits and harms to society
-Universal ethical principles
The USA came into existence in 1776.
That was 238 years ago.
5A - the steel plow
The steel plow allowed farmers to plant their crops as it helped them break up the hard soil easier.
6B - Sod had to be broken to prepare fields for crops.
On the plains, the soil was very hard and covered with soil. Origianl plows had a difficut time breaking through the sod - the steel plow allowed for easier farming for the settlers.
Answer:Estimating the average level of nitrogen in the water
Explanation:
The concerned citizens are trying to determine the average level of nitrogen in the water. They collected the samples for a month in order to get the correct average reading of nitrogen.
They might be interested in knowing whether there is excess nitrogen in water or not as excess nitrogen can overstimulate the growth of aquatic plant and algae. Excess growth can, in turn, clog water intakes, use dissolved oxygen, Block sunlight by covering the entire lake.