In what two plate tectonic settings do most volcanoes occur?

at divergent plate boundaries (ocean ridges or rifts) and at convergent plate boundaries at subduction zones

at convergent plate boundaries at subduction zones and on lowland plains

at divergent plate boundaries (ocean ridges or rifts) and within tectonic plates themselves

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.