Q: You are presented with the quiz "What can be used to remove harmful substances from water?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "treating water is used to remove harmful substances before drinking" and "chlorine bleach is ideal for treating water". So, what's the best answer to the question? | OPTIONS:
- chlorine bleach
- Heat energy
- evaporation
- oxygen
- helium
- Electrical energy
- hydrogen
- Calcium carbonate
A: chlorine bleach

Q: You are presented with the quiz "What sort of fuel burning puts carbon into the atmosphere?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "burning fossil fuels increases the carbon in the atmosphere" and "fossil fuels are not sustainable fuels". So, what's the best answer to the question? | OPTIONS:
- Greenhouse gases
- Organic compounds
- vehicles
- Pollution
- non-sustainable
- chlorofluorocarbons
- Conifers
- an engine
A: non-sustainable

Q: You are presented with the quiz "If the body goes without its requirements a person will eventually get what after a few days" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most people can survive only a few days without water" and "food and water shortages can only lead to diseases and many sick people and sick animals". So, what's the best answer to the question? | OPTIONS:
- healthy
- death
- HIV
- Toxins
- sick
- loss
- tall
- well nourished
A: sick

Q: You are presented with the quiz "What can easily become hot if exposed to heat?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if a thermal conductor is exposed to a source of heat then that conductor may become hot" and "copper is a great thermal conductor". So, what's the best answer to the question? | OPTIONS:
- an object
- engines
- vehicles
- animals
- the skin
- clams
- copper
- Mammal
A: copper