Most marine fishes broadcast spawn and the parents spend no time feeding and protecting the offspring. On the other hand, whales give birth to well developed calves and will feed and protect the calves for long periods of time. What do you think is the best strategy? Has this strategy paid off in the great whales?

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.