Picture below shows an astroid and a comet.

Which of these statements best describes the difference between asteroids and comets?

A. Asteroids were formed closer to the sun than comets

B. Comets were formed closer to the sun than astroids

C. Astroids are formed of ice and comets are formed of gases

D. Comets are formed of ice and astroids are formed of gases

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.