Modern science and technology began in the nineteenth century. At that time, there were large-scale scientific and technological research units organized, which had internal and external reasons. The internal reasons were that science and technology were more complicated, specialized, and specialized in this period. The reason was a technological revolution at the time. This passage mainly supports the argument that:. ['Modern science and technology originated at the end of the 19th century.', 'Scientific and technological research units have emerged in modern science and technology.', 'Modern science and technology are the result of internal and external factors.', 'The external cause of modern science and technology is greater than the internal cause.']