Occasionally, and it was always just after they had been happiest together, they suddenly had a feeling of estrangement and hostility, which occurred most frequently during Countess Mary's pregnancies, and this was such a time. [Please select]
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It is the general observation that in most cases of prolonged pregnancies the offspring are males. [Please select]
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Greenwald mentioned one perforate female which weighed only 10 grams, but most reached a weight of at least 30 grams before their first pregnancies. [Please select]
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Earliest pregnancies occur when females are approximately one month old, but most are several weeks older before they become pregnant. [Please select]
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According to recent investigations along this line, seventeen abortions are committed in every hundred pregnancies. [Please select]
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Occasionally, and it was always just after they had been happiest together, they suddenly had a feeling of estrangement and hostility, which occurred most frequently during Countess Mary's pregnancies, and this was such a time. [Please select]
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Pregnancy from post-partum oestrus would seem to be less frequent than pregnancies beginning a few days after birth of the previous litter, and within the period of lactation. [Please select]
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