In the domain eukarya, which physical trait is used to classify organisms?

a)possession of a cell wall
b)cells that do not contain a nucleus
c)cells that contain a nucleus
d)lack of a cell wall

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

What is the difference between bacterial infections and viral infections?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?