*Question*
Fat is used to keep animals warm, and some animals hibernate, living on stored fat until the warm weather returns. Given these facts, what do animals use to store food among the following options: - pan - fat - Urea - calories - sugar - jaws - nest - carbohydrates
**Answer**
fat

*Question*
Using a gasoline engine requires burning gasoline, and gasoline ignites easily and burns vigorously. Given these facts, using a gasoline engine requires what among the following options: - electricity - no ignition - carbon dioxide - easy ignition - difficult ignition - no gasoline - hydrogen and oxygen - adding heat
**Answer**
easy ignition

*Question*
Waxy leaves are used for storing water by some plants, and leaves are long, oval and waxy. Given these facts, what are leaves used to store among the following options: - wind - fats - water - sunlight - lipids - glucose - soil - energy
**Answer**
water

*Question*
Living things all require energy for survival, and energy is used for survival and reproduction. Given these facts, what do all living things require in order to reproduce among the following options: - Proteins - food - DNA - nutrients - energy - Light - bamboo - sunlight
**Answer**
energy