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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
![Cast of Isotelus rex, the largest known trilobite from the middle to upper Ordovician of North Ameri](https://biology-forums.com/gallery/47/medium_12359_29_04_12_6_05_29.jpeg)
![A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_55_09_82661049.jpeg)