Which of the following provides nutrients to a developing embryo, passes wastes into the mother’s blood for disposal and forms tissuses of both the mother and the embryo? a.) placenta b.) umbilical cord c.) amniotic or d.) all of the above

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides