Q: Which of the following forms of energy is released or absorbed in most chemical reactions? OPTIONS:
- light energy
- electrical energy
- sound energy
- heat energy
A: heat energy

Q: Which human organ system exchanges gases with the environment? OPTIONS:
- endocrine
- circulatory
- respiratory
- integumentary
A: respiratory

Q: A wet towel will dry when it is left in the Sun. Which process occurs to make this happen? OPTIONS:
- melting
- boiling
- condensation
- evaporation
A: evaporation

Q: Which best explains the importance of nitrogen in the cycling of energy and matter? OPTIONS:
- Nitrogen increases protein production in plants.
- Nitrogen decreases protein production in plants.
- Nitrogen decreases the effectiveness of photosynthesis.
- Nitrogen increases the effectiveness of photosynthesis.
A:
Nitrogen increases protein production in plants.