Q: What simple machine consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point? A:
OPTIONS:
- pully
- bloom and axle
- spoke
- wheel and axle

Answer: wheel and axle

Q: What does unequal heating of the atmosphere cause? A:
OPTIONS:
- water
- flares
- humidity
- weather

Answer: weather

Q: In drosophila, gradients of morphogens encoded by maternal effect genes determine what? A:
OPTIONS:
- cell mass
- cells axes
- body mass
- body axes

Answer:
body axes