refers to the change in total revenue that results from producing and marketing one additional unit of the product
Dolly is the name of a sheep that has the honor of being the first mammal to be cloned by a group of scientists in England. Dolly was born July 5th, 1997 and she passed away in 2003. She lived for 6 and a half years, as a normal, active ewe.
Although Dolly's life was short, it wasn't your average sheep's life. And where she is now is even more surprising. Dolly in 1997 on the right. Her penmate is Polly, a sheep genetically engineered by the team at Roslin.John Chadwick/AP. Scientists created Dolly in a test tube, after they figured out how to take a sheep egg cell, remove its DNA, and replace it with DNA extracted from a different sheep's skin cell.