Q: Plants supply, ultimately, most of the food eaten by terrestrial animals, along with what gas? Choices: - hydrogen - nitrogen - carbon dioxide - oxygen A:
oxygen

Q: What machine is used to determine the calories in food, as well as the average heat yield from burning various grades of coal and oil? Choices: - radio telescope - thermometer - alethiometer - calorimeter A:
calorimeter

Q: What kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle? Choices: - nervous muscle - skeletal muscle - smooth muscle - cardiac muscle A:
cardiac muscle