This advancement would be crop growing.
When people first started growing crops, this enabled them to stop living nomadic lives, where they had to go from food source to food source, but stay at one location that enable them to grow crops which they needed to make food out of. Eventually, this had led to the formation of villages and ever bigger urban areas :)
Individuals who are 65 and older can get the benefits as well as anyone of any age who is disabled with a physical or mental disability.
Answer:
A. development of automobiles with lower nitrogen oxide and hydrocarbon emissions.
Explanation:
This act implements a comprehensive program to reduce air pollution to protect human health and environment, the amends made in 1990 focused on problems of acid rain, ozone depletion, and toxic air pollution, they established new auto gasoline reformulation requirements and set the Reid vapor pressure standards to control evaporative emissions from gasoline.
