Hydrogen fuel cells are more environmentally friendly than biomass energy in which of the following ways? 1-Carbon dioxide is produced when hydrogen is produced from water in hydrogen fuel cells.
2-No emissions of carbon dioxide from the fuel cell when hydrogen is produced from water.
3-Volatile organic compounds are produced from the production of hydrogen fuel cells.
I only
II only
I and II only
I and III only

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

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

What are the measures taken by the uae government to protect the national tree (ghaf tree)