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24 The ivory-billed woodpecker, long thought to be extinct, was recently reported to be living in a southern swamp area. The most ecologically appropriate way to ensure the natural survival of this population of birds is to (1) feed them daily with corn and other types of grain (2) destroy their...

Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine (1) stores the building blocks of proteins (2) supports the structure of ribosomes (3) produces energy for genetic transfer (4) is part of the genetic code ok...