Thursday, 26. February 2009
Topic: NATURE - on February 26, 2009 at 12:39:00 PM CET
Fish fossil clue to origin of sex
A fossil fish from Australia was one of the earliest known vertebrates to reproduce by fertilising eggs inside the female, a study suggests.
Nature journal says the ancient fish was carrying a 5cm-long embryo.
The fertilisation of eggs by sperm outside the mother's body - external fertilisation - is thought to have evolved before copulation.
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