a theory of overall increase in world near-surface air and ocean temperatures which may be caused by additional heat being trapped by greenhouse gases. the increase of temperatures would cause significant changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans.

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

The cluster of developing cells from conception until birth is called an

24. how are vaccines used to keep people healthy?