Q: You are presented with the quiz "What fuel does fanning a fire provide?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fanning a fire increases the oxygen near the fire" and "fire needs fuel and oxygen". So, what's the best answer to the question?

OPTIONS:
- CO2
- oil
- HPV
- heat
- hot
- Air
- gas
- wind

A: Air
input: OPTIONS:
- Positive
- humans
- Negative
- less water
- mild
- protect them
- It changes life as we know it
- It's inconsequential Now, answer this question: You are presented with the quiz "What impact does recycling have 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 "recycling saves energy, conserves natural resources and helps protect the environment". So, what's the best answer to the question?
A:
output: Positive
You are presented with the quiz "cells can be damaged when they lose their ability to what" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aging occurs as cells lose their ability to divide" and "cell damage also occurs during ageing". So, what's the best answer to the question?

OPTIONS:
- divide
- retina
- produce air
- grow
- produce enzymes
- alveoli
- stay warm
- breathe

Answer: divide
Problem: OPTIONS:
- colors
- light
- Energy.
- a chime
- flavors
- sound
- noise
- waves
Q: You are presented with the quiz "Plucking a string can cause that string to make what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plucking a string can cause that string to vibrate" and "when something makes a noise it is vibrating". So, what's the best answer to the question?
Answer: noise
Problem:OPTIONS:
- hygeine
- emissions
- animals
- growth
- forces
- health
- education
- people

You are presented with the quiz "What can be determined by the average number of people per one unit of area?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "population density is the average number of individuals per unit of area or volume" and "another measure of growth is population density". So, what's the best answer to the question?
****
A: growth
Problem:OPTIONS:
- Smell
- genes
- saliva
- eggs
- sex
- gametes
- fur
- warmth

You are presented with the quiz "To reproduce, mammals attract a mate through what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal needs to attract a mate to reproduce" and "animals mate because of smells". So, what's the best answer to the question?
****
A:
Smell