Q: Fact 1: Energy enters ecosystems in the form of sunlight or chemical compounds. Fact 2: Sunlight is energy released from fusion reactions in the sun. Given the two facts above, what do ecosystems use as energy? | OPTIONS:
- Nutrients
- chemicals
- heat
- wind
- trees
- food
- glucose
- fusion
A: fusion

Q: Fact 1: Energy is used for heating a building by a heating system. Fact 2: Passive solar thermal energy involves heating buildings using direct sunlight. Given the two facts above, a method of heating a building might be what? | OPTIONS:
- dangerous
- Blizzards
- Heated arguments
- threatened
- major threat to health
- Direct sunlight.
- Mothballs
- slow and inefficient
A: Direct sunlight.

Q: Fact 1: Temperature falls from the equator to the poles. Fact 2: Sun's rays are perpendicular to the equator. Given the two facts above, temperatures fall towards the poles as the sun's rays are no longer what? | OPTIONS:
- kinetic energy
- negative
- visible energy
- harmful substances
- perpendicular
- heat energy
- direct energy
- reflecting light
A: perpendicular

Q: Fact 1: Organisms use lipids to store energy. Fact 2: Fish Fish are the ultimate aquatic organism. Given the two facts above, what uses lipids to store energy? | OPTIONS:
- fish
- humans
- water
- cats
- the Sun
- rocks
- ferns
- Man
A: fish