I don't understand how my science textbook can refer to viruses being 'non-living' whilst also stating that they invade organisms to 'survive'. Can anyone explain if and why this is correct?

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

Organize the word parts according to where they appear in a medical term.