Which of the following describes the structure of a dicot stem ? A) It contains a ring-shaped vascular bundle B) It contains central vascular cells C) It contains several layers of xylem that are surrounded by a ring of phloem D) It contains vascular bundles that scattered through the pith tissue

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.