Q: Plants not only contribute food but what else for organisms? Choices: - dioxide - hydrogen - carbon - oxygen A:
oxygen

Q: Organisms that "love" acids are known as what? Choices: - acidophobes - acidic - acid heads - acidophiles A:
acidophiles

Q: What is the smallest particle of an element that still has the element's properties? Choices: - an ion - a nucleus - an electron - an atom A:
an atom

Q: What type of bonds between the bases at the center of the dna double helix hold the helix together? Choices: - helium bonds - ionic bonds - electron bonds - hydrogen bonds A:
hydrogen bonds