Question:
Choose your answer: Is "The nucleus of a metastable isotope is in an excited state and will return to the ground state by emitting a photon in the form of a gamma ray." a good answer to the question "What does a metastable isotope do to return to ground state from an excited state?" OPTIONS:
- yes
- no
Answer:
yes

Question:
Choose your answer: Is "By 1139, Portugal had established itself as a kingdom independent from Leon." a good answer to the question "By what year had Portugal established itself as an independent kingdom?" OPTIONS:
- yes
- no
Answer:
yes

Question:
Choose your answer: Is "They run perpendicular to the "chainlines", which are further apart." a good answer to the question "Which is lines are commonly higher in density, laidlines or chainlines?" OPTIONS:
- yes
- no
Answer:
no