D. the floodplain shrinks
The answer is A) That the seed eating species would disappear, because the seeds would disappear followed by the finches that ate those seeds and the other finches that eat other food like insects would thrive.
The organism or product that is being described in the sentence
above is chalk. This is the product that is formed with the use of the remains
of calcium carbonate. It has a mineral calcite and useful for writing or
drawing in smooth and writable surfaces.