A birdhouse is nailed into a tree 6 feet up from the ground. If the tree grows about 2 feet taller each year, where will the birdhouse be 25 years later?
A. 6 feet
B. 26 feet
C. 50 feet
D. 4 feet
E. 56 feet
Answer: A
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A. peptide B. steroid C. amino-acid derivative D. fatty-acid derivative
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A) testosterone B) sterols C) teichoic acid D) porin
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