President Bush’s approval rating fell at the end of his presidency in part because he A) lost the Persian Gulf War.
B) sent US troops to Panama.
C) failed to stop the Oklahoma City bombing.
D) broke his promise not to raise new taxes.

D on Edge, "broke his promise not to raise new taxes."

Explanation:

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genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

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