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.
A female sheep is called a ewe, and a young female is called a ewe lamb. A male sheep is called a ram, and a young male is called a ram lamb.