TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: Over 99 percent of all species that ever lived on Earth have gone extinct. Five mass extinctions are recorded in the fossil record. They were caused by major geologic and climatic events. Evidence shows that a sixth mass extinction is occurring now. Unlike previous mass extinctions, the sixth extinction is due to human actions. Answer: 99%

SOLUTION: What percentage of all species that ever lived on earth have gone extinct?

PROBLEM: Passage: Scientists may publish articles about their research in peer-reviewed science journals. Peer review means that the work is analyzed by peers, in other words, by other scientists. The articles are published only if the other scientists are convinced that the research is accurate and honest. Answer: peer review

SOLUTION: What is the process where scientific articles are checked and analyzed by other scientists before publication?

PROBLEM: Passage: Enthalpy changes are measured by using calorimetry. Answer: calorimetry

SOLUTION:
Enthalpy changes are measured by using what?