B is the answer because their trying to build and maintain them
Answer:
Conservations
Explanation:
I looked it up to find the answer, I'm smart but not smart enough to know about Roosevelt.
Answer:
Nanotechnology, also shortened to nanotech, is the use of matter on an atomic, molecular, and supramolecular scale for industrial purposes.
Long answer:
Nanotechnology is the design, characterization, production, and application of structures, devices, and systems by controlled manipulation of size and shape at the nanometer scale (atomic, molecular, and macromolecular scale) that produces structures, devices, and systems with at least one novel/superior characteristic or property.
<span>In 1947, President Truman took action against the Communist threats in Greece and Turkey in the first example of what would later come to be known as the "Truman Doctrine". Rather than sending U.S. military assets to directly fight and aid these countries in the fight against Communism, Truman instead pledged financial support, sending $400 million in aid to these two countries.</span>
