Name the two gases that are exchanged when someone breathes.

In which layer do organisms on earth love?

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

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.