Q: The use of mercury-based dental amalgam has gone under question in recent years because of concerns regarding what? Choices: - the expense - the oxygen - the variability - the toxicity A:
the toxicity

Q: What is a hydrocarbon in which there are only single covalent bonds? Choices: - combined - proline - fullerene - alkane A:
alkane

Q: Q: What are biofilms resistant to many common forms of? Choices: - vaccination - termination - assimilation - sterilization A:
A: sterilization

Question: Q: What is the outer layer of the sun made up of? Choices: - oxygen - nitrogen - gas - plasma A:
Answer: plasma

*Question*
Q: Chains of small molecules called nucleotides make up what? Choices: - chromosomes - peptides - proteins - nucleic acids A:
**Answer**
nucleic acids

Q: Triggered by changes in the environment, migration and hibernation occur as cycles on what temporal basis? Choices: - bi-annually - seasonally - monthly - annual A:
annual