query: Why human endometrium doesn't stay constant?
positive_passages.docid: 127926
positive_passages.text: Why is menstruation in wild animals not a disadvantage to organismal survival?
negative_passages.docid: 20847
negative_passages.text: Staying in Phase On The Grid
negative_passages.docid: 5454
negative_passages.text: Does our DNA change during our lives?
negative_passages.docid: 98455
negative_passages.text: Twin Paradox: Still a Paradox?
negative_passages.docid: 8583
negative_passages.text: Dependence of Friction on Area
negative_passages.docid: 79900
negative_passages.text: Why don't elves have more babies?
negative_passages.docid: 50975
negative_passages.text: Why do the big nuts always remain at top? The Brazil-nut Effect
negative_passages.docid: 117791
negative_passages.text: Why does the frequency of a wave remain constant?
negative_passages.docid: 30830
negative_passages.text: How long will it take to show the signs of pregnancy after intercourse
negative_passages.docid: 51882
negative_passages.text: Probability of an ectopic pregnancy
negative_passages.docid: 158077
negative_passages.text: There should be a space between the period and the N
negative_passages.docid: 104188
negative_passages.text: Why does my water pressure fluctuate?
negative_passages.docid: 109091
negative_passages.text: Why do non-constant periodic functions have no limit at infinity?
negative_passages.docid: 133865
negative_passages.text: Why does the composition of the air does not change with altitude?
negative_passages.docid: 16449
negative_passages.text: Why does hair grow after trimming but remains at a constant length after a while?
negative_passages.docid: 106681
negative_passages.text: Why are female clones more often produced
negative_passages.docid: 133957
negative_passages.text: Cell life: division for immortality or reproduction with aging