Q: Fact 1: Mammals conserve body heat with their hair or fur. Fact 2: Body heat is trapped in the haircoat. Given the two facts above, what do mammals use to conserve heat? | OPTIONS:
- energy
- Energy.
- fur and fat
- blood
- haircoat
- food
- body water
- tail
A: haircoat

Q: Fact 1: If food is not immediately used by the body for energy then that food will be stored for future use. Fact 2: Body fat is stored energy. Given the two facts above, what not digested is used as energy storage? | OPTIONS:
- RNA
- Urea
- fat
- glucose
- carbohydrates
- food
- protein
- DDT
A: fat

Q: Fact 1: Nitrogen is found in proteins, nucleic acids, and chlorophyll. Fact 2: Chlorophyll gives plants a green color. Given the two facts above, what is found in that that gives plants a green color? | OPTIONS:
- Energy
- sunlight
- acetic acid
- Energy.
- Solar energy
- water vapor
- Light
- nitrogen
A: nitrogen

Q: Fact 1: Organisms use lipids to store energy. Fact 2: Humans are complex organisms. Given the two facts above, what uses lipids to store energy? | OPTIONS:
- joules
- animals
- carbon
- weathering
- mammals
- a fish
- cats
- humans
A: humans