question: Write a question you would see in a school textbook. OPTIONS:
- marine mammal fossil
- swamp fern fossil
- trace fossil
- index fossil
answer: Certain fossils can be used to help determine the age of the rock layer in which the fossils are found. Which type of fossil is best to use when making this determination?

question: Write a question you would see in a school textbook. OPTIONS:
- speeding up the process of decay.
- taking nonliving matter from the environment.
- slowing the spread of disease.
- helping to distribute seeds.
answer: Vultures are scavengers that most likely help ecosystems by quickly consuming dead organisms and

question: Write a question you would see in a school textbook. OPTIONS:
- swimming in a lake
- riding a bicycle
- cutting down a rain forest
- using solar energy
answer:
Which human activity is most harmful to the natural environment?