Scientists are interested in cloning an extinct animal called the gastric brooding frog. This strange frog swallows its eggs and broods its young within its stomach. So far, scientists have successfully used cloning to make an embryo of the frog, but they have yet to raise one to maturity. What steps might the scientists have used to clone this extinct species? Why was it important for scientists to determine before the experiments that the great barred frog is a close relative to the gastric brooding frog?