You are presented with the quiz "Microbial fuel cells convert chemical energy into what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "microbial fuel cells convert chemical energy into electrical energy" and "electrical energy can be converted into kinetic energy and heat energy by an electric motor". So, what's the best answer to the question?

OPTIONS:
- Something with exactly eight protons
- Something studied by Michael Faraday
- scraping oneself on a contaminated object
- Something that moves in an elliptical orbit
- skin redness and pain, possible swelling, blisters, fever, headaches
- remove toxic material from the stomach before it is absorbed
- Something that can be converted to kinetic and heat energy by a motor
- Something made of glass, fiberglass, polyethylene, or vinyl

Answer: Something that can be converted to kinetic and heat energy by a motor

You are presented with the quiz "Earthworms are terrific for plants and are important what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "earthworms are important deposit feeders that help form and enrich soil" and "earthworms are terrific for plants and soil". So, what's the best answer to the question?

OPTIONS:
- deposit feeders
- more abundant
- grounders
- agriculture
- Quality of life
- the environment
- dirt grubbers
- bird enemies

Answer: deposit feeders

You are presented with the quiz "What enables bones to perform movement?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "muscles can only contract" and "bones work with muscles to perform movement". So, what's the best answer to the question?

OPTIONS:
- contraction
- Energy
- sensory neurons
- looseness
- Chemical energy
- Vibrates
- fur and fat
- layers of fat

Answer: contraction

You are presented with the quiz "Which action will cause chemical bonds to form?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chemical bonds form when substances react with one another" and "vinegar and baking soda, when mixed together, react chemically to create carbon dioxide gas". So, what's the best answer to the question?

OPTIONS:
- A compound that donates proton
- igniting fuel and oxidiser
- nuclear reactions
- Mixing baking soda and vinegar
- By wind and rain
- heat and pressure
- converting electricity to heat
- production of energy

Answer:
Mixing baking soda and vinegar