Q: What is the term for the breakdown of unstable isotopes into stable elements? Choices: - isotopic decay - radioactive decrease - secondary decay - radioactive decay A:
radioactive decay

Q: What part of the atmosphere is the heat source? Choices: - troposphere - magnetosphere - ionosphere - stratosphere A:
stratosphere

Q: Q: Most protists are aquatic organisms and need what kind of environment to survive? Choices: - dry - warm - cold - moist A:
A: moist

Question: Q: A phase diagram plots temperature and what else? Choices: - friction - power - movement - pressure A:
Answer: pressure

*Question*
Q: How many stars are in our solar system? Choices: - two - none - three - one A:
**Answer**
one

Q: Which branch of biology studies animal behavior? Choices: - microbiology - anthropology - embryology - ethology A:
ethology