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It would decrease as their prime food source would be taken away. This would result in a decline in population as the birds wouldn’t have sufficient food.
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B-monomer
I am not sure about the second one but i think it's C
These structures are called Vestigial structures, they resemble structures from the organism's ancestors, but don't have a real purpose for them now.
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This would mean a change in base sequence, which is very important for the proteins to carry out their function. It could lead to a mutation and a change in the role of the protein.