In the 1990s, what reduced the barriers to entry in the local telephone market? the rising popularity of cellular phones the end of a twenty-year patent on telephone technology the licensing of new, smaller phone companies the deregulation of the local telephone industry

Scientists developed the first successful human cell culture in vitro (grown in a lab) in the 1950s by removing cancer cells from a woman. this concept has allowed modern scientists to successfully grow organs. which of the following answers  bestdetermines why there was success?   neurons send a signal to the cell to multiply.a large blood supply to the cell allows enough nutrients for growth.cells are the basic unit of life and thus can regenerate if in a controlled environment.cells cannot reproduce on their own, and the scientist manipulates them to grow.