Q: You are presented with the quiz "Viruses are so small that they can be seen by what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "viruses are so small that they can be seen only with an electron microscope" and "once the camera is tuned with the microscope, the focusing depends on the microscope lens". So, what's the best answer to the question?

OPTIONS:
- focusing a lens
- A computer
- looking close
- rays or beams
- sunlight
- bending light rays
- seeing smaller
- tuning eyes

A: focusing a lens
input: OPTIONS:
- pearls
- streams
- shells
- diamonds
- rain
- beads
- cooled
- liquid Now, answer this question: You are presented with the quiz "What type of water formation is formed by clouds?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "beads of water are formed by water vapor condensing" and "clouds are made of water vapor". So, what's the best answer to the question?
A:
output: beads
You are presented with the quiz "What happens to your leg when muscle fibers shorten?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "muscle contraction occurs when muscle fibers get shorter" and "contraction of the muscle straightens the leg". So, what's the best answer to the question?

OPTIONS:
- they bend
- It decreases
- It straightens
- permineralization
- It expands
- Damages them
- Localized damage
- Dehydration

Answer: It straightens
Problem: OPTIONS:
- insects
- plants
- humans
- some mammals
- oxygen
- elephants
- monotremes
- Frogs
Q: You are presented with the quiz "what uses lungs to breathe air?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lungs are used for breathing air by land animals" and "elephants are the largest land animals". So, what's the best answer to the question?
Answer: elephants
Problem:OPTIONS:
- xerophytes
- ragweed
- mammals
- dry plants
- animals
- cactus
- alpacas
- bacteria

You are presented with the quiz "Producers that are adapted to very dry environments are called what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plants that are adapted to very dry environments are called xerophytes" and "if the plant is green, it is a producer". So, what's the best answer to the question?
****
A: xerophytes
Problem:OPTIONS:
- friction
- vibration
- voltage
- energy
- power
- bamboo
- mechanical
- heat energy

You are presented with the quiz "What do guitars make sound with?" 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 "nylon string is by far the softest sound on the guitar". So, what's the best answer to the question?
****
A:
vibration