There are C. primary gases
Answer:
Making farm land (agriculture), terraforming (so we can build homes etc.)
It really depends on which war the question is referring to, but if it's referring to WWII the answer would be true.
Answer:
Agriculture yielded more food, which made denser human populations possible, thereby supporting city development. Farming led to dense, settled populations, and food surpluses that required storage and could facilitate trade. These conditions seem to be important prerequisites for city life.
