Q: You are presented with the quiz "What decreases the melting point of water?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adding salt to a liquid decreases the melting point of that liquid" and "the addition of salt increases the density of water". So, what's the best answer to the question?

OPTIONS:
- The bending of a ray of light
- heating liquids
- cloudy and rainy weather
- Movement of an air mass
- increasing its density
- global warming
- tectonic plates coliding
- movement of tectonic plates

A: increasing its density
input: OPTIONS:
- starfish
- warmth
- a flame
- trees
- cigarettes
- an object
- sunlight
- engines Now, answer this question: You are presented with the quiz "What converts chemical energy into light and heat energy?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fire converts chemical energy into light and heat energy" and "fires are large uncontrolled flames". So, what's the best answer to the question?
A:
output: a flame
You are presented with the quiz "Intelligence is primarily encoded in what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "characteristics that are encoded in DNA are called genetic traits" and "intelligence is primarily a genetically inherited trait". So, what's the best answer to the question?

OPTIONS:
- Man
- RNA
- SNPs
- p53
- deep set eyes
- reading glasses
- DNA
- python code

Answer: DNA
Problem: OPTIONS:
- With their voice
- Chemical energy
- mechanical waves
- With their eyes
- during the day
- With their movements
- With their hormones
- electrically
Q: You are presented with the quiz "How do ants communicate?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ants communicate with chemicals called pheromones" and "pheromones are insect hormones". So, what's the best answer to the question?
Answer: With their hormones
Problem:OPTIONS:
- climate
- Negative
- Neutral
- Positive
- Smoking
- It expands
- sweating
- None

You are presented with the quiz "What effect has the existence of humans had on the environment?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "conserving resources has a positive impact on the environment" and "humans meet some needs and wants by using resources found in the natural environment". So, what's the best answer to the question?
****
A: Negative
Problem:OPTIONS:
- sunlight
- heat energy
- Calcium carbonate
- hydrogen and oxygen
- calcite
- carbonic acid
- less water
- salinity

You are presented with the quiz "What is one element used to create caves?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone" and "when caves contain connecting rooms, they are called caverns". So, what's the best answer to the question?
****
A:
carbonic acid