Which of the following statements is true the matter in an ecosystem must be continuously replenished the total amount of energy and ecosystem remains the same the only way to return matter to the soil decomposition or the total amount of water in an ecosystem is always decreasing

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.