Answer:
The finch population decreased.
Explanation:
When finches eat seeds, some pieces fall onto the ground which grow up to have more seeds. The seeds that survived were too big for a finches tiny beak. Without this cycle in place, seeds had no way to reproduce.
The population of finch gradually decrease from 1975 to 1978 that caused the seed abundance to decrease too.
During 1975 to 1978, there were no small seeds present for the feeding of finches, this cause the gradual decrease in the number of small beak finches.
Many small beak finches died during this time.
This affects the seed production too, because when birds eat seeds they help them to disperse in many other areas, which increase pollination and increase seed production.
Thus, when the population of finches decrease, the seeds production also decreases during 1975 to 1978.
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