Question

a population of finch birds with medium sized beak colonizes an island with plants having medium and large sized seeds. after a disease wipes out all medium sized seed what is most likely to happen.

a)they will become extinct
b)beaks will become larger
c)beaks will not change at all
d)beaks will become smaller

Answer 1

The answer is (c) beaks will not change at all.

Answer 2

Answer:

Beaks will become larger as a result of adaptive radiation.

Explanation:

• These passerine birds have evolved to live in a variety of habitats and eat a variety of foods, some of which are largely plants and others of which are mostly insects.
• The varying bill configurations are obviously tailored to the various feeding strategies used by the many Galapagos species, including probing, gripping, biting, and crushing.
• Because the ancestor of Galapagos finches arrived in the islands before other species of birds and met a wealth of unfilled ecological niches, this variety is explained.
• As a result of adaptive radiation, its offspring developed a variety of finch species with lifestyles that could take advantage of opportunities that other species on different continents were already taking use of.

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