Q: What molecule consists of two atoms of hydrogen and one atom of oxygen? Choices: - carbon monoxide - hydrogen peroxide - air - water A:
water

Q: The flow of water through the sponge is unidirectional, driven by the beating of what? Choices: - antennae - cilia - fin - flagella A:
flagella

Q: When fuel is burned, most of the energy is released in what form? Choices: - precipitation - carbon dioxide - humidity - heat A:
heat