One the XY belong to the male (XX is for females ) and these chromosomes are sex chromosomes and are always the same in every human being ( well except for some genetic disorders)
<span>The EPA under the Toxic Substances Control Act also referred to as the TSCA are responsible for setting rules and regulations regarding polychlorinated biphenyl, PCB. Tina should reference the TSCA to help support her protest against the very toxic chemicals and compounds in PCB.</span>
