(Q).
Fact 1: Water vapor cooling causes that water vapor to condense.  Fact 2: All lenses are anti-fog coated to eliminate condensation.  Given the two facts above, answer the question "What could cause lenses to fog?" with the following options:  - energy of moving objects  - Transpiration from plants  - Water evaporating  - heating liquids  - Water vapor cooling  - Ice sublimating  - scattered light  - The atmosphere
(A).
Water vapor cooling


(Q).
Fact 1: Dehydrating food is used for preserving food.  Fact 2: Preservatives Preservatives are required to prevent spoilage.  Given the two facts above, answer the question "What can prevent food spoilage?" with the following options:  - prolactin release  - one celled organisms  - hydrating food  - cleaning food  - airing out food  - Electric generators  - a hydraulic system  - dehydrating food
(A).
dehydrating food


(Q).
Fact 1: Oxygen is just one substance transported by the blood.  Fact 2: Active brains and muscles require more oxygen and nutrients.  Given the two facts above, answer the question "Muscles require substances transported in the body by" with the following options:  - sugar  - food  - fibers  - fat  - neurons  - blood  - glucose  - bones
(A).
