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When do embryos have blood?

How long does it take for embryos to have blood cells?

2007-02-11 08:40:21 · 1 answers · asked by wd20x2 3 in Science & Mathematics ➔ Biology

1 answers

When bone marrow begins to form probably? Since mother's blood never mixes with babies.

2007-02-11 08:58:59 · answer #1 · answered by Kipper to the CUP! 6 · 0⤊ 0⤋

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