Q: Fact 1: Earth 's tilt on its rotating axis causes seasons to change. Fact 2: During that time the seasons change from fall to winter to spring to summer. Given the two facts above, earth 's tilt on its rotating axis causes fall to change to what? | OPTIONS:
- winter
- break off
- Inches
- cold
- autumn
- spring
- fall permanently
- nothing
A: winter

Q: Fact 1: Microbial fuel cells convert chemical energy into electrical energy. Fact 2: Fuel cells are devices that directly convert hydrogen into electricity. Given the two facts above, what do microbial fuel cells transform hydrogen into? | OPTIONS:
- Renewable energy
- Electrical energy
- kinetic energy
- electromagnetic energy
- an engine
- transportation technology
- Solar energy
- Oil
A: Electrical energy

Q: Fact 1: Melting is when solids are heated above their melting point. Fact 2: Ice cubes melt in liquid water. Given the two facts above, what, when heated, turns into liquid water? | OPTIONS:
- gasoline
- oil
- a solute
- fire
- ice cubes
- a prism
- mussels
- Energy.
A: ice cubes

Q: Fact 1: Plants that are adapted to very dry environments are called xerophytes. Fact 2: Succulents, bromeliads and cacti are xerophytes. Given the two facts above, cacti are adapted to what? | OPTIONS:
- the snow
- dry environments
- Animal survival
- survival
- tropical regions
- moist environments
- relocation
- salt and water.
A: dry environments