CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Six-week-old embryo. Brain waves can be detected from embryos of six weeks. The muscle pairs become further developed, resulting in the first embryonic movement although this is not generally felt by the mother. The limbs continue to develop, along with the appearance of a mouth, lips and ears. After eight weeks of development the embryo is known as a foetus.
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