Embryo Leech.
Man We did create from a quintessence (of clay); Then We placed him as (a drop of) sperm in a place of rest, firmly fixed; Then We made the sperm into a leech-like clot; then of that clot We made a (foetus) lump; then We made out of that lump bones and clothed the bones with flesh; then We developed out of it another creature: so blessed be Allah the Best to create! [Qur’an 23:12-14, Translated A.Yusuf Ali]
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