(Q).
Using a gasoline engine requires burning gasoline, and oil and gasoline are fossil fuels. Given these facts, what requires burning fossil fuels among the following options: - Fuel cells - using electricity - animals - Cooking - organisms - engines - lightning - solar power
(A).
engines

(Q).
Oxygen is just one substance transported by the blood, and blood typifies the life, for the life is in the blood. Given these facts, what typifies life among the following options: - Beauty - exercise - Energy - Color - recovery - Movement - Oxygen - Energy.
(A).
Oxygen

(Q).
Abreathing mask is used for keeping harmful particles from entering the respiratory system, and all smoke is harmful to the respiratory system. Given these facts, what keeps smoke out of the respiratory system among the following options: - Cooking - Masks - Glasses - skin - Gloves - Hats - Urea - oxygen
(A).
Masks