For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?
a) it is safe enough to limit all apoptosis
b) it does not alter metabolically active cells
c) it only attacks cells that are density dependent
d) it interferes with cells entering g0
e) it interferes with rapidly dividing cells

Average annual precipitation and are the two major features that define the biomes on earth.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?