Answer the following question given this paragraph: Perhaps the most familiar liquid-solid solution is dental amalgam, used to fill teeth when there is a cavity. Approximately 50% of the amalgam material is liquid mercury to which a powdered alloy of silver, tin and copper is added. Mercury is used because it binds well with the solid metal alloy. However, the use of mercury-based dental amalgam has gone under question in recent years because of concerns regarding the toxicity of mercury. 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
Answer the following question given this paragraph: An alkane is a hydrocarbon in which there are only single covalent bonds. The simplest alkane is methane, with the molecular formula CH 4 . The carbon is the central atom and makes four single covalent bonds to hydrogen atoms. Q: What is a hydrocarbon in which there are only single covalent bonds? Choices: - combined - proline - fullerene - alkane A:
alkane
Q: Answer the following question given this paragraph: planktonic counterparts. Overall, biofilms are very difficult to destroy because they are resistant to many common forms of sterilization. Q: What are biofilms resistant to many common forms of? Choices: - vaccination - termination - assimilation - sterilization A:
A: sterilization
Question: Answer the following question given this paragraph: outermost layer of the sun, made up of a plasma that extends millions of kilometers into space. Q: What is the outer layer of the sun made up of? Choices: - oxygen - nitrogen - gas - plasma A:
Answer: plasma
*Question*
Answer the following question given this paragraph: Nucleic acids consist of chains of small molecules called nucleotides, which are held together by covalent bonds. The structure of a nucleotide is shown in the Figure below . Each nucleotide consists of:. Q: Chains of small molecules called nucleotides make up what? Choices: - chromosomes - peptides - proteins - nucleic acids A:
**Answer**
nucleic acids
Answer the following question given this paragraph: Examples of behaviors with annual cycles include migration and hibernation. Both are innate behaviors. They are triggered by changes in the environment, such as the days growing shorter in the fall. 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