(Question)
Q: Of the nine classes of vertebrates, how many are fish? Choices: - one - four - three - five A:
(Answer)
five

(Question)
Q: Gain or loss of what causes an atom to become a negatively or positively charged ion? Choices: - protons - neutrons - nucleus - electrons A:
(Answer)
electrons

(Question)
Q: What term describes a region of space around an atom that has a non-zero probability for an electron with a particular energy? Choices: - orbital lobe - minimal orbital - related orbital - atomic orbital A:
(Answer)
atomic orbital