<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>
The answer is concentration gradient. Have a good day.
I think that it is A. it forms new mountains under the water
I only have one reason but hope it helps!
Because without those bases pairing there <span>would be no structure of a DNA.</span>