question: Write a question you would see in a school textbook. OPTIONS:
- sodium
- iron
- sulfur
- copper
answer: In a mixture, a magnet is used to separate some particles from sand. The dark particles are most likely made of which element?

question: Write a question you would see in a school textbook. OPTIONS:
- resist green light.
- bend all colors except green.
- reflect green light.
- reflect all colors except green.
answer: Many leaves appear green because the leaves

question: Write a question you would see in a school textbook. OPTIONS:
- hunting
- waterway pollution
- habitat destruction
- competition for resources
answer:
Thousands of years ago, several species of large mammals existed in North America. These species became extinct not long after the first human settlement of North America. Which human activity most likely contributed to the extinction of these mammals?