Complete the sentences to describe the different levels of organization in organisms. A(n)
is a group of organs that work together to perform a common function.

A(n)
is a group of tissues that work together to perform a common function.

A(n)
is a basic unit of structure and function of all living things.

A(n)
is a group of cells that work together to perform a common function.

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.