Which of the following statements are examples of descent with modification (multiple answers)?
a. Dr. Tucker and bacteria having 16 SRNA genes with different nucleotide sequences
b. Observing that all pigeons have backbones
c. The increase in average beak height of finches that was observed on the Galapagos islands between generations as a result of natural selection
d. A mother and father with cystic fibrosis having a child with cystic fibrosis



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