Which of the following is the best definition of a system? A. a collection that shares the same function
B. The form and arrangement of an object or material.
C. Anything that takes up space and has mass.
D A group of objects and materials that are interrelated.

Which short-term environmental change is most likely to lead to ground shifting, landslides, and the collapse of buildings or roads? forest fires flooding earthquakes

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.

Which is the following can combine in a cell to convert a lower-energy molecule into a higher-energy molecule?