Relate the four chemicals on the rungs of a dna ladder to the letters of our alphabet. describe the code these "letters" can form. what does the code do?

The 4 letters are A, T, G, and C. Adenine (A) always pairs with Thymine (T) and Guanine (G) always pairs with Cytosine (C). These are nucleic acids that are used to store and transfer genetic information

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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