(Q).
Lung cancer is most often caused by exposure to tobacco smoke, and tobacco is smoked in pipes or in cigarettes or bidis. Given these facts, what is lung cancer most often caused by among the following options: - the Moon - Pollution - sunlight - Chemical energy - fossil fuels - cigarettes - burning - marijuana smoke
(A).
cigarettes

(Q).
Cold fronts cause thunderstorms as they pass by, and if cold air is advancing on warm air, the front is called a cold front. Given these facts, which situation can cause a thunderstorm among the following options: - Fog rising over a lake - pressure differences. - Earth's axis of rotation is tilted - Setting up lightning rods - Cold air advancing on cold air - Cold air advancing on warm air - Changing the angle of the sun - fall moving to winter
(A).
Cold air advancing on warm air

(Q).
Some animals' fur grows thicker for staying warm in the winter, and mammals have hair and fur. Given these facts, why do some animals have hair that grows longer during the winter among the following options: - It expands - to make braids - to wear a scarf - to attract mates - When it's cold - to stay warm - It remains dormant - genetic diversity
(A).
to stay warm