Nitrogen is very crucial for life because it is one of the important ingredient that is needed for plants to grow. Human and animals who eat plants materials obtain nitrogen from the plant. Nitrogen is needed in the humans and animals bodies for formation of proteins and nucleic acid which are very essential for life. When animals and humans die the nitrogen in their bodies return to the earth again and is used by plants.
Not necessarily, it all depends on the schools that require it
The first problem with any DCT is that we have no evidence that there even is the requisite God, much less which God’s commands are the commands of that God. There are hundreds of different ethical systems attributed to “God.” This is so even within the umbrella of Christian theism; all the more so when we consider other theisms.