What parts of the external anatomy are useful for the frog obtaining food? Describe the circulatory system of the frog. List the organs and functions in your description.

Compare the digestive system of a frog to that of an earthworm. Why are they different? Have at least two similarities and two differences.

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.