Can anyone please help me write my research paper on the use of vaccines please ?

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

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

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?