input: OPTIONS:
- heating
- fuel
- Water
- energy Now, answer this question: Q: All chemical changes involve a transfer of what? A:
A:
output: energy

input: OPTIONS:
- neutrons
- mass
- hydrogen
- energy Now, answer this question: Q: Every chemical reaction occurs with a concurrent change in what? A:
A:
output: energy

input: OPTIONS:
- circulatory system
- muscular system
- lymphatic system
- nervous system Now, answer this question: Q: What helps control the muscles and maintain balance? A:
A:
output:
nervous system