In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
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Question: Question: What occurs before the endometrium thickens in estrous cycles? Answer: ovulation

Answer: Ovulation occurs before the endometrium thickens in estrous cycles.


Question: Question: What has increased the greenhouse effect? Answer: human actions

Answer: Human actions has increased the greenhouse effect.


Question: Question: How did seismologists originally measure the intensity of an earthquake? Answer: mercalli scale

Answer:
Seismologists originally measured the intensity of an earthquake with the mercalli scale.