MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Development of a foetus in the womb. Historical artwork of a human foetus at five stages of its development (at 1.5, 2, 3, 6 and 12 weeks). The illustration is by Ernst Haeckel and appeared in the 1891 edition of his Anthropogenie.
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