Why was the founder species of finches on the galapagos islands able to form such a large variation of beak types?

a) the birds colonizing the islands were reproductively isolated.
b) there were many varieties of finches that landed on the island.
c) they mated with other species of finches that were already present on the islands.
d) the new beak types allowed for faster mating.

b.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

i think the answer is b.

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i hope this you