In the 1970s, the U. S. Environmental Protection Agency (EPA) introduced stricter regulations on the exhaust emissions of gas-powered vehicles. In order to comply with these regulations, automobile manufacturers began installing a new invention that effectively decreases the toxic pollutants that are produced by internal combustion engines. This invention, the , has effectively reduced the smog and air pollution in every city in the United States.

c would be the correct !

hope this !

~bbgluver

silk

indigo  

rice

all the other answers are wrong

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.