Problem:OPTIONS:
- kinetic energy
- flow of electrons
- hydrocarbons
- energy
- Greenhouse gasses
- heat energy
- fossil fuels
- Greenhouse gases

You are presented with the quiz "a lawn mower converts _ into motion" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "agasoline lawn mower converts gasoline into motion" and "gasoline is made up of hydrocarbons". So, what's the best answer to the question?
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A: hydrocarbons

Problem:OPTIONS:
- nerves
- Epidermis
- the skin
- strong
- biceps
- Bend
- lungs
- forces

You are presented with the quiz "what can only contract?" 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 "muscles in the upper arm called biceps are used to flex the arm". So, what's the best answer to the question?
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A: biceps

Problem:OPTIONS:
- scarce resources
- harmful substances
- damage in DNA
- critical organs
- the skin
- Veins and arteries.
- layers of fat
- heat or cold

You are presented with the quiz "Cells have multiple repair mechanisms to fix what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells have multiple repair mechanisms to fix mutations in DNA" and "dNA damage is called mutation". So, what's the best answer to the question?
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A: damage in DNA

Problem:OPTIONS:
- follicles
- bioaerosols
- Energy
- sweating
- fossil fuels
- layers of fat
- fur and fat
- fungi

You are presented with the quiz "What from dead proteins help to insulate and protect the body?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hair helps to insulate and protect the body" and "hair is built by the hair follicle from dead proteins produced by skin cells called keratin". So, what's the best answer to the question?
****
A:
follicles