Q: What is the matter through which sound waves travel? Choices: - dust - mass - air - medium A:
medium

Q: What is the term for animal-like protists that are usually single-celled? Choices: - eukaryotes - vertebrates - larvae - protozoa A:
protozoa

Q: The kidneys help control acid-base balance by excreting _____ and generating bicarbonate that helps maintain blood plasma ph within a normal range? Choices: - magnesium ions - sodium ions - lithium ions - hydrogen ions A:
hydrogen ions

Q: The most common curved mirrors are what? Choices: - solid - concave - convex - spherical A:
spherical