Q: What occurs when there are differences in fitness among a population? Choices: - evolution - natural process - natural change - natural selection A:
natural selection

Q: If a gyroscope is not spinning, it acquires angular momentum in the direction of what? Choices: - gravity - acceleration - velocity - torque A:
torque

Q: Q: Salt hydrolysis is a reaction in which one of the ions from a salt reacts with what? Choices: - proteins - fat - air - water A:
A: water

Question: Q: The first living cells may have evolved around how long ago? Choices: - 900,000 years - 6 billion years - 2.2 billion years - 4 billion years A:
Answer: 4 billion years

*Question*
Q: What is the term for the gas in smog that can damage plants? Choices: - dioxide - carbon - sulphur - ozone A:
**Answer**
ozone

Q: What force increases a slide downhill and decreases a slide uphill? Choices: - nuclear - frictional - tension - gravity A:
gravity