Listen to the passage and fill in the blanks with the words you hear. Scientists ______1______animals for many years. In 1952, the first animal, a tadpole, was cloned. Before the_______2______of Dolly, the first mammal cloned from the cell of an______3______, clones were created from embryonic cells. Since Dolly, researchers have cloned a number of large and small animals including sheep, goats, cows,_____4____, pigs, cats, rabbits, and a gaur. All these clones were created using __________5________.Hundreds of cloned animals exist today, but the number of __________6_______is limited. Attempts at cloning certain species have________7________. Some species may be ________8______to somatic cell nuclear transfer than others. The process of stripping the nucleus from an_______9_______and replacing it with the nucleus of a donor cell is a traumatic one, and _________10__________may be needed before many species can be cloned successfully.