Gestation, called pregnancy in humans,
is the period of time during which the fetus develops, dividing via
mitosis inside the female. During this time, the fetus receives all of
its nutrition and oxygenated blood from the female, filtered through the
placenta, which is attached to the fetus' abdomen via an umbilical
cord. This drain of nutrients can be quite taxing on the female, who is
required to ingest slightly higher levels of calories. In addition,
certain vitamins and other nutrients are required in greater quantities
than normal, often creating abnormal eating habits. The length of
gestation, called the gestation period, varies greatly from species to
species; it is 40 weeks in humans, 56–60 in giraffes and 16 days in
hamsters. pregnancy in humans
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