To study the dependant variable, a scientist must a. manipulate the independent variable b. have more than one control group c. manipulate the dependent variable d. have more than one experimental group select the best answer from the choices provided a b c d

9. wind power creates pollution. water air soil noise

Nkentucky, intoxicating beverages (beer, whiskey, wine, etc.) are involved to some extent in approximately % of collisions fatal to pedestrians.

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.