Osteogenesis imperfects is a genetic disorder in which a person has very fragile bones due to the lack of collagen. In order to study the disease effectively, the defective gene is inserted into the nucleus of mice embryos so that they will develop the disease.

Which of the following is an advantage of using embryonic stem cells in medical research? a. the use of embryonic stem cells is much less expensive than the use of adult stem cells. o b. no living tissue is damaged when scientists use embryonic stem cells. o c. embryonic stem cells are able to differentiate into a wider range of cells than adult stem cells. d. there is no controversy surrounding the use of embryonic stem cells.