Q: Q: What are the tiny sacs in the lungs where gas exchange takes place? Choices: - vacuoles - ganglion - chambers - alveoli A:
A: alveoli

Q: Q: Much of the iron produced is refined and converted into what? Choices: - plastic - wood - sugar - steel A:
A: steel

Q: Q: Stringed instruments can help show the relationship between tension and what in strings? Choices: - volumes - temperatures - lengths - frequencies A:
A: frequencies

Q: Q: What is the particular sequence of amino acids in a longer chain called? Choices: - atomic sequence - molecular sequence - carbon sequence - amino acid sequence A:
A: amino acid sequence