Across
- 2. The ability to do work
- 3. Humans eat food to generate heat they are ____
- 5. Invertabrates have no _____
- 6. baby frogs are called ____
- 8. Force is measured in _____
Down
- 1. Birds lay ______ eggs
- 4. When heated particles rise and cooled particles sink
- 7. Hunams have a ___ chambered heart