A certain species of frog come in 2 colors green and brown. A population of these frogs live in and along the river. In 1980 a very large drought occured causing most of the river to dry up. Most of the plants died as well. Why did the green frog popullation decrease?

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.