A group of paleontologists recently announced that a site in Utah has yielded fossils of some of the biggest armored dinosaurs ever found, and that they were at least 25 million years older than any similar dinosaur type previously found in North America.
Before scientists learned how to make asynthetic growth hormone, removing it painstakingly in small amounts fromthe pituitary glands of human cadavers.
(A) scientists learned how to make a syntheticgrowth hormone, removing it painstakingly (B) scientists had learned about making asynthetic growth hormone, they had to remove it painstakingly (C) scientists learned how to synthesize thegrowth hormone, it had to be painstakingly removed (D) learning how to make a synthetic growthhormone, scientists had to remove it painstakingly (E) learning how to synthesize the growth hormone,it had to be painstakingly removed by scientists