Answer: AIDS
The doctors have been looking for a cure for Acquired Immune Deficiency Syndrome, most widely known as AIDS since 1981. There has been vaccines for polio while other treatments for cancer however, there is way fewer cure for AIDS since then.
Because, although they dumped all the tea they didn't harm anything on the ship and took great care to leave the ship the same way they found it.
Lenin's New Economic Policy allowed some of the "Agricultural collectives" to reappear in the Russian economy, since it was clear farmers needed some sort of incentive to produce more.
Answer:
It was to find a path to Asia through North America, but they found that trade was very profitable.
Explanation:
The correct answer is A. Managing and building of irrigation systems.
This act of newlands reclamation covered states of western where texas was not added because it had no federal lands but it was added later.
The act set some money aside for sales which were made in semi-arid public lands for maintenance and construction of projects on irrigation.
If a land becomes well irrigated it is then sold and that money being put in a fund which revolving in order to support other projects which are of the same type.