Q: The diversity of life on earth today is the result of what? Choices: - spontaneous mutation - generation - mass extinction - evolution A:
evolution

Q: What is made of gases that are essential for photosynthesis and other life activities? Choices: - air - ocean - stratosphere - atmosphere A:
atmosphere

Q: Q: What is a benefit of low sulfur coal over high sulfur coal? Choices: - greater enerty - lower cost - less erosion - less pollution A:
A: less pollution

Question: Q: The most abundant formed elements in blood, erythrocytes are red, biconcave disks packed with an oxygen-carrying compound called this? Choices: - plasma - hydrogen - pus - hemoglobin A:
Answer: hemoglobin

*Question*
Q: What does the megaspore mother cell produce after meiosis division? Choices: - four diploid megaspores - two diploid megapores - two haploid megaspores - four haploid megaspores A:
**Answer**
four haploid megaspores

*Question*
Q: Do motile cilia usually occur in small or large numbers on the cell surface? Choices: - neither - mixed - small - large A:
**Answer**
large