Q: Since europeans settled in the united states, about what percentage of topsoil has eroded away? Choices: - 42 percent - 10 percent - 25 percent - 33 percent A:
33 percent

Q: What kind of map can show the features of the bottom of a body of water? Choices: - topographic - basic - country - bathymetric A:
bathymetric

Q: Q: What leads to multiple copies of a chromosomal region? Choices: - minimilizations - gene modification - subtractions - duplications (or amplifications ) A:
A: duplications (or amplifications )

Question: Q: The other ammonium ions are changed into nitrogen gas by what? Choices: - fluctuations bacteria - fungi - accompanying bacteria - denitrifying bacteria A:
Answer: denitrifying bacteria

*Question*
Q: In hornworts, the horns are the sporophytes that rise up from what? Choices: - the roots - the polyol gametophyte - the breaza gametophyte - the leaflike gametophyte A:
**Answer**
the leaflike gametophyte

(Question)
Q: What type of compounds make up the cells and tissues of living things? Choices: - hormonal - microbial - proximal - biochemical A:
(Answer)
biochemical