Question: Q: What happens to the core of a star when it begins to run low on hydrogen?    Choices:  - it expands  - it disappears  - it explodes  - it contracts  A:
Answer: it contracts

Question: Q: Fertilizer runoff can create what type of zones in the ocean?    Choices:  - fresh zones  - barren zones  - hot zones  - dead zones  A:
Answer: dead zones

Question: Q: Which type of bryophytes are named for their horn-like sporophytes?    Choices:  - arthropods  - flatworms  - tapeworms  - hornworts  A:
Answer: