Q: You are presented with the quiz "What effect would less garbage have on the environment?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "landfills have a negative impact on the environment" and "less garbage goes into landfills". So, what's the best answer to the question? | OPTIONS:
- It decreases
- lowered energy cost
- an unknown effect
- no effect
- protect them
- a better effect
- reduced heat
- a worse effect
A: a better effect

Q: You are presented with the quiz "What can make a river deepen and widen?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "erosion causes a river to become deeper and wider" and "water erosion has similar consequences as wind erosion". So, what's the best answer to the question? | OPTIONS:
- birds
- sunlight
- Sediment
- wind and water
- rainfall
- flooding
- weeds
- arteries
A: wind and water

Q: You are presented with the quiz "What are used for sensing sounds by animals?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hearing is used for sensing sound by animals" and "hearing requires functioning ears". So, what's the best answer to the question? | OPTIONS:
- ears
- echolocation
- birds
- fibers
- toads
- the nose
- Frogs.
- the blood
A: ears

Q: You are presented with the quiz "What is used to determine the age of fossils?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "radioactive dating is used to determine the age of fossils" and "radioactive dating requires the use of a decay curve". So, what's the best answer to the question? | OPTIONS:
- Calcium carbonate
- dinosaurs
- a barometer
- electron microscope
- a thermometer
- a decay curve
- chemical equations
- Physical weathering
A: a decay curve