THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY
Human foetus, illustration. The foetus develops within its mother's uterus, surrounded by a fluid-filled amniotic sac. The placenta (not seen) on the uterus wall acts through the umbilical cord (centre left), bringing oxygen and nutrition to the developing foetus, and taking away waste products. Development to full term and birth takes around 37 to 40 weeks.
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