8
pilohippus
merychippus
mesohippus
eohippus
equus
(modem horse)
(dawn horse)
give two similarities between each of the skulls that might lead to the conclusion that these are all related species.

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.