A company that produces hair dryers buys some of the components, but it makes the heating element, which it can produce at the rate of 930 per day. Hair dryers are assembled daily, 249 days a year, at a rate of 365 per day. Because of the disparity between the production and usage rates, the heating elements are periodically produced in batches of 2,200 units. a. Approximately how many batches of heating elements are produced annually

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.