question: Write a question you would see in a school textbook.
answer: During a lab investigation a scientist heats a solid substance. The scientist observes that the solid has two different melting points. The scientist is able to separate the two resulting liquids. Which statement best classifies the original solid substance?

question: Write a question you would see in a school textbook.
answer: After a rainstorm, a big pile of rocks blocks part of a mountain road. Which event most likely caused the rocks to move onto the road?

question: Write a question you would see in a school textbook.
answer:
In humans, a trait can be determined by one pair or many pairs of