Q: You are presented with the quiz "These are a type of protein that provides cellular energy in the human body:" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "protein is used to repair cells by the human body" and "enzymes provide cellular energy, repair tissue organs and cells". So, what's the best answer to the question?

OPTIONS:
- health
- pituitary
- coiled
- Proteins
- unique
- growth
- enzymes
- complexity

A: enzymes

Q: You are presented with the quiz "What forms silica sand?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "erosion causes deposition" and "silica sand is primarily mined from sandstone deposits". So, what's the best answer to the question?

OPTIONS:
- Sediment
- loose soil
- sunlight
- fire
- soft soil
- erosion
- gasoline
- rocks

A: erosion

Q: You are presented with the quiz "What causes iron to rust?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chemical weathering causes iron in rock to oxidize" and "when iron oxidizes, it rusts". So, what's the best answer to the question?

OPTIONS:
- Chemical energy
- High pressure
- harmful substances
- Greenhouse gasses
- permineralization
- Chemical weathering
- Cold temperatures
- Direct heat

A: Chemical weathering

Q: You are presented with the quiz "Where do adult sponges attach themselves?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adult sponges are sessile" and "hydras are sessile, attaching to some sort of substrate". So, what's the best answer to the question?

OPTIONS:
- animal
- stalk
- Sediment
- coastlines
- plant
- substrate
- ocean water
- loose soil

A:
substrate