Which of these statements describes the papillary layer of the skin?
a. this layer contains dendritic cells and merkel cells.
b. dermal papillae contain capillary loops to nourish the epidermis.
c. melanocytes in this layer provide protection from uv radiation.
d. this deep layer of the dermis is made of irregularly arranged connective tissue fibers.

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.