question: Write a question you would see in a school textbook. OPTIONS:
- growing tall to hide in trees
- changing fur color to hide from predators
- developing large paws to protect themselves from the wind
- producing shallow root systems to protect themselves from the cold air
answer: Which physical characteristic do some organisms have that helps them survive in the Arctic?

question: Write a question you would see in a school textbook. OPTIONS:
- It maintains a constant body temperature.
- It prevents damage to internal organs.
- It makes oxygen for all the cells in the body.
- It supplies the body's needs for growth and energy.
answer: Why is a healthy diet important?

question: Write a question you would see in a school textbook. OPTIONS:
- the total mass of available carbon
- the way organisms use carbon
- the physical state of carbon-containing molecules
- the molecule in which a particular carbon atom is found
answer:
Which of the following remains constant in Earth's carbon cycle?